@tsuyukihime I made some clarifications to my post, but I want to be as explicit as possible: I am not condoning rape or excusing what he has done. (Though, granted, he did seek her consent before he did anything, so there's a bit of a grey area in terms of implications, so I wouldn't be certain how a court would rule in this situation. I'd assume because there's some implicit threat of force or because she has reason to believe she will be raped that she would legally be in the clear, but I can't say for certainty as I do not the law in Japan, nor how it would even be ruled because it's a very grey situation when you think about it--though the author is trying to make it so he is in the wrong.)
But no, I do not think he is in the right, rather I think that I hope this event leads to some kind of reform or him getting some kind of psychiatric help for his mental illness. That does not excuse his actions, it explains that he's essentially sick and needs help.
It's a difficult situation because it's the conflict between what would be right to appease some cathartic sense of justice versus someone who acts in ways that are wrong for no cognitive fault of their own, because they cannot control how they think due to Anti-Social Personality Disorder. It's not something with an easy answer because it's a particular type of disease that makes someone behave in a way that is antithetical to how we would idealize behavior to best improve society, yet at the same time it does not sit well to find someone who is so clearly mentally unwell through no fault of their own irredeemable.
This conflict does not make me a rape apologist in any sense, just someone who is conflicted on the situation.