doth protest too much, and yet ye return each and every chapter.
Lemonade, Happy Ending, Sakana no Miru Yume (sort of), and Kyou Kara Yonshimai (sort of)... Others: Naruto, Bleach, One Piece, School Days... etc, etc. Once people start reading/watching something, no matter how bad it gets, it is a tendency to watch it through until the end.
The writing is terrible... nonsensical drama, behaviors, and actions. It will probably pull another terrible arc to continue it's own depressing existence.
It is a lot like self-torture, I have no idea why people do this to themselves.