I just binge skimmed this series. It's okay-ish.
Is it weird that I actually like the suicidal/homicidal stalker more than the blackmailer? Well, dislike less, I guess.
At least Seiji understands that his actions are wrong on...many levels. He struggles with it on a much deeper level and is willing to turn himself into the police for his crimes. On the other hand, Nakamachi seems much more unrepentant. Blackmail an innocent victim of sexual assault into hooking up with your romantic rival so that you can get back together with a person who has already rejected you? AND not apologize for any of it? Besides that, Seiji's actions are very much "heat of the moment" kind of bad. Nakamachi is literally planning this out knowing full well what the consequences are.
That's how I feel at least.