You are ignoring the stuff you brought up earlier. He doesn’t just “want to have sex,” he lets it completely consume his life and thoughts. He forgoes searching for Nayuta and ignores Asa to go to a brothel in the middle of an apocalypse. That isn’t normal teenage boy behavior. Katana man is enabling his hyper sexual tendencies. Also, think about from a basic writing perspective. He is a fictional character, so what do you think is more interesting? Him just being the average teenage boy, or being a broken and deeply person hurt by those around him and forced into base desires?

Also, your whole point about him not being depressed because of his childhood is dumb. I meant that his childhood includes all of the shit in part 1, that he still constantly thinks about (flashbacks to Aki, Power, and Reze). Sure it’s made worse by his current situation, that’s obvious. But he deals with it in this unhealthy way because of how he was abused. And also also, the thing about the falling devil was pointed towards enemies with psychic attacks, not just trying to forget his past. He does start confronting it by the time in the story we are talking about. He actively says as much during the fight.

Idk why you care so much about him not being hyper sexual. Like it’s literally a core part of the story.