Responses
It's definitely weird, but that's just manga plots for you lol. Chapter 0 explains his motivations. He "failed" to save his childhood friend, and therefore feels guilty and wants to prevent someone else from dying.
He’s not suicidal too . His childhood friend died while doing nothing to help when he saw those signs. So he feels guilty and sees the suicidal man as someone he feels he needs to take care of to relieve him of his guilt in not being able to be there for hood childhood friends when he needed someone the most.
black haired going this far to help someone he doesn’t know as much as to let him live in his house doesn’t sound weird to you?
Not in a bad way but my guess is that he’s probably suicidal too or even attempted before but he’s trying to not give up to these thoughts by going this far? What if this is the only thing that keeps him from actually doing it and that’s why he’s giving at his all