So it already finished with 3-4 volumes

MC were kinda ugly , no offense haha , he seems work as top hitman and doing assasin job every day.
But he realized he don't have friend...so he decided to make social interaction at school.

Sadly because he was ugly and looks like a creep, all his classmate shunned him, the class president(female) think he is a creepy stalker and even want to expel him.

There is also a handsome boy who was popular in his class that looked down on him

One day the handsome boy were dating a glasses girl for fun, but somehow a thug from evil organization took interest on the girl, at karaoke, the thug who was a mafia boss rape the girl, yes he really do it....while the boy watched with swollen face(he already being punching back)

MC then come and kill all the thugs, the girl were unconcious but the boy see how strong our mc is. He apologized to mc and say let's be friend.

Skip skip, there is a yandere girl who like mc, she was the student council president, one day someone stealing the money they gonna use for the festival at school, they want to build food stall it seems. Without any proof, they accused mc. MC try to defend himself along with the handsome boy but all majority think mc is the one doing it and say the handsome boy were to kind. In the end, the handsome boy try to go to class locker room and put his own money to help mc, but he also find mc trying to put a lot money on the locker(MC was fillthy rich).

MC say thank you and the boy say it is ok we are friend, much later mc tell him he know the one who steal it and tell it to class president, she did not believe mc, but then the class president show herself and throw the money to her and say she is the one stealing it. When class president asked why, she then say she want to see mc getting more isolated so he have no friends and only her and her as his companion......The class president were confused and say why the hell you like mc, he was not worth it but the yandere girl laughed and say how stupid she is, and tell her to be careful of her words, she know the class president family were struggling in money, and she can easily twist the story and proof by making the class president as the culprit.

She then ordered the class president to spy on mc or something, and she agreed because she was being blackmailed. In the end the class president go to karaoke with all of her classmate, but they did not invite mc. She lie to the yandere girl of knowing where mc is....the yandere girl then come chasing her and she run with all her might.
At that time mc were drinking vodka in the bar, it is the place where he took assasin assignment or chilling around

Weird right ? i remember the title have aono , it have ono ono word thing, because the title were mc name.

Anyone know it ? it was 2018 manga i think or 2019

I think you are talking about this:

https://www.mangaupdates.com/series.html?id=154718