Attack on Titan: Chronicle

You read the title, watch the series instead.

The series is amazing and is worth watching even though you might not have the time to watch the series I would fit it in to your schedule somehow. If in any way you wouldn't be able to fit watching the series into your schedule I guess this would work but I don't feel like you would get the same emotional attachments in preparation for season 4 which will lead to you not getting the same impact when something happens