I have to admit that in the initial episodes I was very troubled about the age difference. This was almost a stumbling block. However, what the young actor brings to his character is super unique- he brings just the right mixture of innocence, youthful insecurities but also a level of deeper maturity well beyond his age. Perhaps that desire to be a mature adult made him look like he was older though he clearly wasn't mature on so many levels. All performances were good but I thought that his acting and character were brilliant. I personally esteem the fact that Japanese filmmakers would often present the intimacy of a relationship honestly and in more intense albeit thankfully not obscene ways. However here the relationship was driven almost purely by passion. Yes, it was an intense passionate relationship but I frankly did not see it as lasting romance. The age difference is definitely a big red flag because our female protagonist is meeting a young boy still in high school. Although I do believe the feelings and passion was mutual, the idea that the young man is potentially a victim was there. It is true that emotions of this scope can derail a young person and make them particularly vulnerable. Keeping his student's ID to get him to come back was manipulative too. Now although there are no absolute standards for falling in love, it's understood in most societies that a young person should be protected. So while I bought into the idea of shared interests, longing for each other and loving passion, I still did not see the protagonists as a real or healthy couple. I'm not sure I fully understood the ending. In spite of several significant issues, the writing was consistently strong, story engaging and acting superb, so I still think this is a strong production. This is the reason for a strong rating.