These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Author's Saving Throw: After the outcry when it was revealed that Hatsumi decided to stay by Ryoki's side despite his abuse, a Hot Gimmick S novel was released (though not by the mangaka) soon after in which Hatsumi actually thinks twice about it, breaks up with Ryoki and goes to Shinogu.
Darkness-Induced Audience Apathy: One of the few shoujo manga that fits this trope. Every character is a jerk or a idiot, and nobody receives any major character development (in fact the opposite seems to happen). The Esoteric Happy Ending doesn't help, not even when the novel ended up fixing it.
Draco in Leather Pants: A lot of fangirls are willing to overlook Ryoki's near-sociopathic behavior because of his good looks. Azusa, as well - no matter what "Dark and Troubled Past" he had, it's disturbing to justify his manipulation and attempt at having Hatsumi violently gang raped.
Esoteric Happy Ending: So Hatsumi decides to stay with Ryoki in spite of his verbal and emotional abuse of her because she thinks that marriage will make him nicer to her? Azusa goes back to being a vengeful bastard after learning that Ryoki's father was responsible for his mother's woes? Shinogu abruptly decides to go off and become a monk after realizing that he'll never get Hatsumi? And we're supposed to believe that all this makes for a happy ending? The real happy ending, however, happens in Author's Saving Throw.
Fan-Preferred Couple: Some fans prefer Hatsumi to have ended up with Shinogu, who was sensitive and gentle and wanted the best for her, instead of the possessive and often abusive Ryoki. And in the novel, they do.