If mc doesn't kill himself at the end, or at least cut ties with Nagisa, this whole thing is meaningless to me. If he acknowledges what he did, he should know he has entirely lost his right to live (as with the other pedophiles). His obligation only goes as far as getting Nagisa off the island and setting him up somewhere safe. If he stays, even at Nagisa's request, then he has not reflected enough.
If mc doesn't kill himself at the end, or at least cut ties with Nagisa, this whole thing is meaningless to me. If he acknowledges what he did, he should know he has entirely lost his right to live (as with the other pedophiles). His obligation only goes as far as getting Nagisa off the island and setting him up somewhere safe. If he stays, even at Nagisa's request, then he has not reflected enough.