So this is Aku no Hana "light" where you actually don't see how sick the mind of the female cast is.
This is actually worse than Aku no Hana, because people will have more sympathy with "mob rule" and "mental torture" as well as "sexual baiting".
By the way, we have the duality often described as the "good cop, bad cop"-phenomenon in this story, where one entity tries to appeal the victim while the other one abuses the victim. In reality, both of them are harmful to the victim, but the victims mind will cause it to become open/"intimate" with the seemingly "good person" in the process, making it harder for him not to obey their collective interests.
Don't let the surface fool you, both of the female characters are sadistic to the root,otherwise they would've opposed each other to the point where there would be only 1 or no member in the club.
I'd advise to add the psychological-tag to this manga, because even if it is subtle, once you've read enough psychological-tagged stuff, you will understand how nasty this manga is in reality.
The main character basically becomes a victim of Stockholm syndrome over the course of the story, so this is not a comedy but rather a horrible mess of how to torture the mind of the sane reader.