INCLUDES SPOILERS because I give my full opinions on the story from start to end

I was recommended this manga for the reading challenge and from the title i just found it funny and thought this will be a laugh as I got into it I felt bad for Kurosawa as instead of it being a ecchi about a master fapper it was this guy was blackmailed constantly into doing disgusting deeds to people this girl didnt like because she caught him in the girls bathroom. Once you get past that part of the story its rewarding and a fun read to see how he gets back into his friend group and social circle after coming out as the guy responsible.
I honestly think that Kurosawa should have mentioned Kitahara when he told the class he was responsible for the acts against his class because he was blackmailed and forced into doing so just because she had a grudge and hated people. So it was unfair for him to have to then endure the other 3 years of his school life being bullied and ignored because of Kitahara's blackmail whereas she got away completely free. Thats what I'd change is that I would have him include her in his confession so that he didnt have to have 3 years of bullying because of her and she didnt even apologise or mention anything.
I loved Kurosawa's friend Nagaoka as he didnt give up on Kurosawa and eventually became good friends with him leading to Kurosawa's life not being a disaster. I also liked Takigawa because of similar reasons.