About the name "Punishment," it's kind of right. He punishes the girls, but I would say not much for what two of them did, or let him through.
Now he had a revenge against douche only. (Which come on. That douche was no big deal compared to some).
Douche bully him, but after he rubbed what the teacher thought of him, douche said he was going to stop, and douche didn't even do anything criminal ever again. (He was going to try to rape one, but until recently she was his girlfriend, and she ridiculed him when they broke up, not to mention cheated on him, it's wrong anyway I know, but he didn't do it. and in the end. The other one let herself be seduced to make the revenge plan work, douche was disgusting, it was, but it wasn't rape there, since the girl who set him up to get arrested).
And well, my friend says it is only netori, but douche steals the girl the MC liked and confessed, even though he had an affair or two with her and then threw her in the trash (figurative sense), to me it is netorare, but the author didn't want to highlight this, so it kind of goes unnoticed.
And my anger is that as I said, the MC gives a half-assed punishment to the girls. But he becomes a kind of sponsor for them, paying them and giving them expensive stuff.
I would rather he stay with the blue haired girl, and get revenge on the other two by rejecting her. (To close 10/10, create a douche's mother, and sister of his old crush and stay with them, instead of the other two)