What Do You Mean, It's for Kids?
Manga
Often times, productions that are marketed to children or Teenagers make us wonder if they were created for them, because of potentially explicit content, serious and mature plots or both. Namely, if these shows have an awful lot of Parental Bonus, Parent Service, and the like. Unfortunately, this can also bring Moral Guardians out of the woodwork if it seems to be blatant enough. This can also happen when something is given a G rating but has an awful lot of potentially explicit content.

Manga, 30 vol, 1994
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A Manga about a Middle-Aged Salaryman Strugged With Complex Themes with a Gecko/Unsolved Finale That Lead lots of Peoples Believ That this Manga Is a Seinen of the Older Age Bracket Right? No, It's Pubblished under "Young Jump" Which Is the Seinen Demo Aimed at Younger Audience!

Manga, 74 vol, 2001
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Full of Gory Imagery and Some High-Stake Games, Is still Considering a Kid's Manga in Homeland Howewhere in America due to the Scrutiny the Manga Get Avoided in the Children's Library Shelves.

Manga, 72 vol, 1999
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and its anime adaptation; the manga was serialized in Weekly Shonen Jump and the anime series is aimed at younger teenagers and is shown on a family-friendly time slot in Japan, but it still has a very dark tone, and tackles some pretty serious topics, including death, loss, relationships, slavery, mass murder, suicide, etc, which a lot of kids won't understand or might get frightened by. The series also has a fair amount of profanity (especially in the uncut versions, both English and Japanese), a lot of rather crude and sexual scenes (like the Sexy Jutsu, some swimsuit scenes, a few character designs, Kakashi's books, Drunken Rock Lee, Jiraiya's antics, breast jokes and the Thousand Years of Death), a massive amount of violence, some terrifying imagery, especially from villains like Orochimaru, Sasuke, early Gaara, Madara Uchiha and the Akatsuki (notably Itachi, Hidan, Pain, Obito and Kisame), a large amount of tearjerker moments, and a lot of the fights can be extremely bloody, cruel and violent, and then there is Jiraiya, who is extremely perverted and does stuff no kid should be watching at all. When the anime first aired on Cartoon Network in North America, the show was noticeably toned down (for example, words like kill and death being replaced by "destroy" and "defeat", deaths being shown off-screen, backstories being changed, blood edited out, etc) but it didn't stop it from still being violent, especially for a kids series, as some scenes, such as several violent fights, the Sexy Jutsu, drunken Lee, Jiraiya's perverted nature and several deaths (most notably, the Uchiha clan massacre) were left uncensored. Viz Media and Sho Pro later averted this trope when they released the uncut version of the anime, now with a well-deserved TV-14 rating on a late-night weekday time slot on Adult Swim.

Manga, 14 vol, 1996
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It is in fact classified as a kodomo manga. However, its strong sense of continuity and characterization over decades (and thus generations of target demographics), as well as frequent use of violence and even occasional deaths, has people convinced it's meant for an older crowd.

Manga, 27 vol, 2001
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started off as a light-hearted shonen (ignoring the Elrics' backstory) with an Antagonist of the Week popping up often until several episodes in. After Nina's death the dark moments got more on the closer side together and more frequent. By the mid-point it hit full Cerebus Syndrome and by the end it resembled more of a seinen than a shonen. The original manga and Brotherhood, however, stay generally shonen even with their dark moments.

Manga, ? vol, 1997
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is a Shonen manga in the vein of Dragon Ball (Eiichiro Oda's main inspiration for the series) that's supposed to be meant for all ages, but it surprisingly features a huge amount of adult content that seems to push every single boundary of the Shonen genre to the extreme, what with insane amounts of extreme violence (including all sorts of extremely bloody and messy fights), some sexual material, foul language befitting of a sailor, frightening imagery, a gigantic plethora of surprisingly incredibly heart-wrenching moments, racism, slavery, torture, and genocide that would make A Song of Ice and Fire look like a picnic, some truly vile and heinous villains, one of the most horrific and utterly evil totalitarian governments in all of fiction being largely responsible for all the suffering in the series' otherwise optimistic setting, and so much more. It's telling that the U.S. version of the anime adaptation tried to make it kid-friendly by reducing most of the violence and language for any kids channel, including Cartoon Network, but after 4Kids dropped the license, Like what Viz Media and Sho Pro did with Naruto, Funimation averted this trope when they released the anime in its uncensored form, now with a well-deserved TV-14 rating.
PandoraHearts is a shonen manga series similar to Black Butler. Like Black Butler and Death Note, it probably would be more suited for a Seinen magazine, due to its violence, characters with violent and complex pasts (quite a few involving Eye Scream) and generally being quite a mature manga series. This is something that has only gotten darker and darker as it goes on, especially what with the rampant character death the author likes to pull on people.
PandoraHearts is a shonen manga series similar to Black Butler. Like Black Butler and Death Note, it probably would be more suited for a Seinen magazine, due to its violence, characters with violent and complex pasts (quite a few involving Eye Scream) and generally being quite a mature manga series. This is something that has only gotten darker and darker as it goes on, especially what with the rampant character death the author likes to pull on people.

Manga, ? vol, 2021
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This Manga Don't Shy Away from Being a Shonen Manga (Pubblished on Bessatsu Shonen Magazine). The Cover of the 1nt Volume Show a Woman Scuffed, With Bikini get Tortured in a Snuff-Style Violence by a Psychopathic High-School Mate whit undiscutible Gore that Is Much more Realistic than Shingeki no Kyoujin.

Manga, 19 vol, 2009
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Much Worse the Manga Won The Shogakukan Award in the Children Category instead of the Shoujo Category for Teenager Girls. The Manga Rotating around Two Main Characters Being Deraglied for Future Sexy Boys or Sexy Girls being a Pedophile. (About that kind of scenes, that is like a whole different issue with this manga. This is aimed at middle schoolers, the same age the characters have, this is kids from like 10 to 14, that at least is the target of Nakayoshi were it serialized. About that, one of the comments the author included at the start was her editor telling her "This is not a Nakayoshi story" well IT ISN'T, WHAT I DON'T REALLY KNOW IS HOW IT WENT ON FOR SO LONG. When you think of Nakayoshi you think of mangas in the wave of Sakura Card Captor or Sailor Moon, but this is far from that wave. I know it is common for 14 years old to start being interested in love and maybe sex, but I think this manga really gets annoying and uncomfortable with the "sexual theme". There are no sexual scenes per se, but there are a lot of pseudo-sexual ones, if anybody were to take out of context the protagonist's faces, expressions or poses and scenes anybody would think they are from some kind of erotic manga.)

Manga, 14 vol, 1994
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In regards to the Rebuild series, Hideaki Anno mentioned briefly that it was intended for teenagers and even kids, and that the message of the series was important for their ears more so than anyone else. You know, that show where a naked teenage girl grows to the size of a planet and then falls apart, where another character goes through horrific Mind Rape, and ended up squarely defining pessimism in the Super Robot genre. In the States, it was once the victim of the opposite trope; nowadays Evangelion is put on par with AKIRA, Legend of the Overfiend and violent anime/hentai in general. In spite of this, all of the movies in the series (both based on the original series and the Rebuild of Evangelion quadrilogy) are rated G for General Audiences under Japan's equivalent of the MPAA.

Manga, 5 vol, 1996
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is full of mature themes and taboo sexual relationships/metaphors, and as such has never received a rating lower than 13+ (The Rough Equivalent of The Josei Demographic) on a North American release. However, the show and the Manga is indeed a shoujo, and was scheduled at a timeslot on TV Tokyo in which lots of young children would be watching (for a few months, it aired right before Beast Wars).

Manga, 21 vol, 2000
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The manga is meant to be shoujo, but it's often been mistaken for josei due to most of the characters being young adults and its depiction of romance and sexual relations being more realistic and grounded than most manga aimed at teenage girls.

Manga, 18 vol, 2000
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Another Seinen Manga that Could be Mistaken as a Manga for Older Adults. While Is Themes Is Somewhat Aimed at those of their 30s the Magazine Which Is Pubblished Is "Young Animal"

Manga, 25 vol, 1996
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ran in a shonen magazine, despite having Un-Family Friendly Crude Humor and Rape as Drama. Its better-known sequel Great Teacher Onizuka is a little toned down, but still features many of the same themes. The English translation was released with a "Mature Teens" rating.

Manga, 4 vol, 1974
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The original Getter Robo manga wasn't just aimed at kids, but a Merchandise-Driven series meant to sell action figures. The second chapter features Ryoma, the main lead, kicking an attack dog's head clean off, and Hayato, the deuteragonist, ripping a high-school boy's face off and slicing off another's ears. In general, it's hard to find a chapter of the original run that doesn't feature at least one moment of insanely brutal violence, and two of the three leads are Unscrupulous Heroes at best initially. The anime is a different story, though, featuring far less violence relative to the manga and much cleaner depictions of the heroes.

Manga, 42 vol, 1984
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This is a series for ten year old boys, but the high amount of violence wouldn't pass for a kids manga in the States. Not helped by the fact that its primary demographic in the West in The New '10s shifted to adult fans. The Namek Saga, for example, is possibly the most graphic and violent saga that the series has given us, which was controversial for its time and one of the reasons why the series was criticized in the '90s by Moral Guardians.

Manga, 9 vol, 2000
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The Manga Is Shonen and the Series on Prime video Is Rated 7+ (Which mean It's for Older Children aged from 7 and Up) Both the Two Adaptation Fall from Non Child-friendly Content Despite this. But in Japan Like The Manga and the Prime Video Show Is Still Kid-Friendly.

Manga, 28 vol, 2012
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An odd in-universe meta-example. The series is a Shōnen which means its audience is boys aged 8-18. However, Yamada-kun and the Seven Witches also exists in-universe as a book about Yamada's high school life that he reads aloud to his three-year-old son in the epilogue. While there's not anything in the story that would traumatize a three-year-old, most aspects of the humor (which is often mildly sexual) and intrigue (which is based on teenage drama) would probably fly over a toddler's head so you have to wonder why Yamada thought a kid that young would be the prime audience.

Manga, 7 vol, 2001
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The last time Fuzuki and Hazuki saw each other, they were fighting; Hazuki revealed that she was pregnant with Aoi's child and resolved to leave if her mother refused to give her blessing. Her subsequent Death by Childbirth ensured that she and her mother never got to patch things up.

Manga, 8 vol, 2000
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Invoked by the editor In-Universe: the storybooks Chi reads are incredibly profound for something seemingly aimed at children! Then it turns out they're written for Chi specifically and are purposely profound so as to get her thinking.

Manga, 12 vol, 2005
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It's a Magical Girl series aimed at young girls, but there are some risque jokes and one of Amu's love interests is much older than her (he's in high school and she's in elementary school). There's also the fact that Utau has a very blatant Big Brother Attraction towards Ikuto.

Manga, 11 vol, 2007
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Shiki runs in Jump Square, which is a Shounen manga magazine, despite having obvious seinen overtones.
• The ever heated internet argument about what is truly Shonen or Seinen will never die, but is almost accepted that monthly shonen manga will be more lax about showcases of detailed violence and sexually suggestive themes to the point of nudity.
• The anime, though, was run in an adult programming block in Japan—and the Funimation release is rated TV-MA.
• The ever heated internet argument about what is truly Shonen or Seinen will never die, but is almost accepted that monthly shonen manga will be more lax about showcases of detailed violence and sexually suggestive themes to the point of nudity.
• The anime, though, was run in an adult programming block in Japan—and the Funimation release is rated TV-MA.

Manga, 32 vol, 1998
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While its content is pretty standard for Shonen anime, the 4Kids dub was surprisingly liberal with its censorship. Since it's a series that involves ghosts, mentioning death was hard to avoid, but they also kept some of the darker aspects of the subbed version, like Amidamaru, Li, and Faust's backstories, and the rather violent battle of the climax (to the point where Moral Guardians actually complained).

Manga, 11 vol, 1994
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Ran in Weekly Shounen Champion, a Shōnen magazine. Granted, the series's plot is almost painfully shonen, but its gore and sexuality would be shocking even for a Seinen manga.

Manga, 4 vol, 1999
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The series' sizable Periphery Demographic and some of the bawdier jokes in it (including comments about the girls' breast sizes, Tomo's curiosity about her teachers' sex lives, and Mr. Kimura's portrayal as a Dirty Old Man) lead some people to believe it's a seinen series. However, it's actually a shonen series — i.e. aimed at teenage boys — and was originally serialized in the shonen magazine Dengeki Daioh.

Manga, 19 vol, 1985
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The series is a crime thriller with a lot of mature themes that wouldn't be out of place in a seinen series, with Ash in particular having gone through Rape as Backstory. Despite this, the manga originally ran in a shoujo magazine. Yes, shoujo, not seinen, not shonen, not even josei.

Manga, 6 vol, 1990
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The material was sicking enough to get the series canceled. That and Taro's mannerisms included defecating on the graves of those he killed.

Manga, 5 vol, 2017
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Has plenty of gory violence and mature themes but is published in the shonen Gangan Joker magazine, which has had plenty of stories like that anyway.

Manga, 4 vol, 1988
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The original series is a fairly violent and gory Shonen Jump manga and even has a few scenes featuring uncensored female nipples.

Manga, 5 vol, 2012
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A story filled with themes of drug addiction, suicide, depression, breast cancer and clear yuri undertones, yet published in a magazine aimed primarily at young girls. In full effect on the heavily censored French dub of the anime, even worse on the ill-fated Greek dub that was cancelled during the third episode's broadcast.

Manga, 5 vol, 1972
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The original manga in spades is filled with Gorn and nudity, but it ran in Weekly Shonen Magazine of all things, and some of its elements were actually inspired by children's media (for instance, the demons' ability to fuse together, called gattai in the original, is common in mecha series aimed at young boys). It's no wonder Nagai's next series, Violence Jack moved to a Seinen magazine after many complaints.
• The Toei anime is also aimed at kids, though it's generally Lighter and Softer than the manga. However, it can still be pretty violent by modern day standards, and while there's not as much nudity, it's still there to a degree that some people probably feel is too much for kids to see.
• Unsurprising, knowing most video stores. The OVA is well known for its incredible brutality and the dub is full of swearing. The 1972 anime, on the other hand, was Pitched at Kid-Friendly Material, having several changes to its story and generally being Lighter and Softer in comparison with the original manga.
• The Toei anime is also aimed at kids, though it's generally Lighter and Softer than the manga. However, it can still be pretty violent by modern day standards, and while there's not as much nudity, it's still there to a degree that some people probably feel is too much for kids to see.
• Unsurprising, knowing most video stores. The OVA is well known for its incredible brutality and the dub is full of swearing. The 1972 anime, on the other hand, was Pitched at Kid-Friendly Material, having several changes to its story and generally being Lighter and Softer in comparison with the original manga.

Manhua, 4 vol, 2002
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Very much of the "was this content really created with children in mind?" variety. Head writer Chiaki Konaka, frustrated by the lack of gravity death is typically treated with by children's media, made it a point in Digimon Tamers for death to be permanent and traumatic. Which some people found rather troubling.
• And, hell, one of the whole reasons for the Broken Base was due to feelings that the Moral Guardians might be in the right—showing the show to the later-elementary-age kids who are the (nominal) primary target of the show is a crapshoot as to whether they'll "get" it.
• Showing it to the kindergartenders on the young end of the target demo usually ends in tears and nightmares and is not recommended. (Of course, on the other end of the spectrum, these same elements made it and continue to make it vastly more popular with nearly every over-school-age periphery demographic.)
• The very first episode. A Malidramon lunges at the jugular of a DarkTyrannomon, which explodes as it evolves into MetalTyrannomon, which then squashes the Malidramon with its palm. Pretty concisely sets up the stakes for the series' action beats.
• Beelzemon killing Makuramon be hoisting him by the face and crushing him in his grip. At that point it may not matter
• And, hell, one of the whole reasons for the Broken Base was due to feelings that the Moral Guardians might be in the right—showing the show to the later-elementary-age kids who are the (nominal) primary target of the show is a crapshoot as to whether they'll "get" it.
• Showing it to the kindergartenders on the young end of the target demo usually ends in tears and nightmares and is not recommended. (Of course, on the other end of the spectrum, these same elements made it and continue to make it vastly more popular with nearly every over-school-age periphery demographic.)
• The very first episode. A Malidramon lunges at the jugular of a DarkTyrannomon, which explodes as it evolves into MetalTyrannomon, which then squashes the Malidramon with its palm. Pretty concisely sets up the stakes for the series' action beats.
• Beelzemon killing Makuramon be hoisting him by the face and crushing him in his grip. At that point it may not matter

Manga, 3 vol, 1973
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The manga was apparently Go Nagai's shot at writing a story for children. The various remakes, including the animated version, either play up the sexuality, Beside the Spooky Kid's Show Aesthetic instead of the More Prolonged Horror of Junji Ito's Works.

Manga, 11 vol, 1972
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You'd think that a manga like this that features tons of nightmare fuel, graphic violence and death all involving small children would be classified as Seinen, right? Wrong, it ran in a shonen magazine.

Manga, 1 vol, 1995
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The Game as Well as the CoroCoro Comic, For all its happy-go-lucky goofiness, EarthBound gets notoriously dark sometimes. What other SNES game can you think of that involves stuff like religious fanaticism, police brutality, rape symbolism, dismemberment, and a nightmare-inducing Eldritch Abomination? Then again, many a fan agrees that this is one of the game's best features. Averted on the Wii U Virtual Console, it got a T rating instead of the old E rating.

Manga, 12 vol, 2010
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Inverted With: What do you Mean, It's not for kids? Trope. Peoples Outside of the Japan, Dismiss the PG-13 Rating Just Because It's has a Silly Saturday-Morning Story, but at the Same Time added Occasional Strong Swearing and Seductive Womans for the ecchiness.

Manga, 23 vol, 2016
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When time Passes the Manga become Increasilly Tame in terms of Gore and Seriousness at the point that's Lead lots of Elementary-Schooler to Read this.

Manga, 32 vol, 2003
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Has Drab/Dull Colors, so this Manga Is Automatical Seinen? Nope, It's Pubblished under Shonen Jump!

Manga, 3 vol, 1987
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Like Dororon Enma-kun (Which is Spooky but not Outright Terrifying), Tomie Is a Manga for Little Girls With a Really Disturbing/Mind Screwing Horror Atmosphere on-Pairing With a Movie ala David Cronenberg or Stephen King. And Hasn't anything Related to the Spooky Horror Stories for Children

Manga, 34 vol, 2009
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Tons of Mutilated Body Parts and It's Pubblished under Bessatsu Shonen Magazine.

Manga, 12 vol, 2003
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Instead of Trivialized the Mature Themes, Death Note Don't Reject this, so us Mistaken this for Seinen instead of Shonen

Manga, 8 vol, 2003
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The Plot Is Centered around the Life of Hikkikomori in a Psychological Content instead on Family-friendly Content

Manga, 20 vol, 2016
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This Manga isn't Scary or Horror in any Way, It's More Supernatural than Horror, but Speaking of Livingstocks What Things are inside in the Livestock?

Manga, 5 vol, 2000
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Pubblished under Comic BomBom Is Considering the "Berserk" for Kids.

Manga, ? vol, 2023
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Featured Genocide, Patriarchism, Social Ostracism and Other Family-unfriendly Governments Movements that a Young Teenager Don't Understand Figured a Young Child.

Manga, 27 vol, 1983
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Has a More Badass Fights Straight-up from a Seinen Manga, and Having a Gritty Post-Apocalyptic Setting ala Mad Max, but It's Pubblished under Shonen Jump, yep But It's Popularity among Adults who Read this Manga Didn't Help.

Manga, 34 vol, 2000
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Same Thing as for Capeta (Realistic Visual.) but not Just for This, Beck Has Tons of Strong Language That is Unusual for a Slice of Life Shounen Manga

Manga, 17 vol, 1972
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The Manga Is Shonen, but the Anime Is Hardly Placed as "Shonen" Because the Author intended to Considering Yakyuukyou no Uta a Spokon Anime Aimed at the General Audience and You Realize That Is Full on Front-Nudity

Manga, 27 vol, 2001
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The Female MC Counterpart of The-Witcher Saga (Which Is a Gritty Dark Fantasy Story Series Aimed at Adults.) While Claymore Is a TV-Y7/TV-PG Example this, Featured Gory Images and The Demons are Being Stabbed With Swords in a Brutal Way.

Manga, 21 vol, 2003
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More Likely, What do you Mean, It's not aimed at Males? Moresco, the Manga Is Pubblished on a Shojo Magazine but the Romantic POV for Every Instance Is More Aimed at the Shonen or Seinen Demographic, but not Just This, The Manga Explore the Philosophy of the Vampire Associated With the Righterous Papal Movements