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.
Draco in Leather Pants: Sakuya led an extremely hard life as a kid/teenager, has a decent Freudian Excuse because of that and does somewhat get better at the end of the manga, but more than one fangirl forgets that at best he's a Jerk Ass Woobie, and his treatment of Aine skirts Rape Is Love many times.
Double Standard: OTOH, many fans blame Aine and bash her as a "Mary Sue" (anime) or an "Extreme Doormat" (manga), but they say nothing about Sakuya because he's OMG SO HOT. Even worse, some go as far as to victim-blame Aine for all of the abuse heaped on her and saying that she is responsible for said abuse.
Idiot Plot: In the anime, most of the situations are consequence of bad decisions and things that the characters shouldn't do or say. The worst part is that they obviously should know that, like the record company producer making stupid decisions or Sakuya admitting his past as a troublemaker to a reporter.
Mary Sue: Anime!Aine has been accused many times of being one, specially since she appeared only in the second half of the anime.
What an Idiot: Riri, Riri, Riri. You could have had Atsuro at your feet even if just for the public, but then you had to verbally crucify his sister/girlfriend aka the girl you wanted to steal him from? Enjoy your verbal lashing from the person you wanted for yourself.
Yoko Oh No: In-story. Not only Aine was attacked by Aucifer rabid fanbrats, but in the manga she actually lost a friend named Sakura when the other girl found out she was Sakuya's girlfriend. Sakuya was NOT happy when he found out and played a small Batman-Gambit to punish Sakura and teach her that Aine wasn't having it easier.