Looking for a yaoi manga i read years ago about childhood friends, the MC liked a guy in his class but the other friend sabotages his relationships or something and would get off from the comforting him after he was hurt. Oh the yandere friend had a sister who was equally messed up and helped him in his schemes XD Please help me out ive been searching like crazy
Kataomoi Opera?
Is it by Harada? I read something that almost fits your description.. but there was no sister. It probably isn't this though.
http://www.mangago.zone/read-manga/suimenka/
Yesss! It's Katakoi Opera! Turns out i had it but it was buried beneath so much mangas. Thank you so much! You guys are awesome. It wasn't Suimenka by Harada but i really loved that manga and the themes are pretty close, so thanks anyway <3
Of-topic but just finished this drama and my inner fujoshi is internally fangirling. Like I ship "TQ's physcho" and the "Gluttonous Sociopath" together. They are so cute even when they are fighting against each other but them as friends is just too much for my fragile heart,