Curate, connect, and discover
If Kunikida comes back (which I hope he does), I think it might have something to do with the book, more specifically the page that was with Fukuchi before he died. We don't know what happened to the page after the divine being's appearance, but if it hasn't, I don't know, disappeared, it could still be used to reverse the damage caused by the divine being, perhaps even bringing back those who were killed by it.