This plan of the time travelers doesn't make sense. They want him to get into a relationship with a world destroying being, and then somehow break-up without destroying the world?
@MangaAce1 I'm hoping that there is still a lot of backstory about the time travellers to come since I'm not entirely sure how they can even exist unless the destruction of the world isn't complete and there will be enough survivors to keep developing technology well beyond our current capabilities.
@koikun Who, Ichika? She's Fumi's sister and we know from past chapters (6 and 7) that Ichika seems to be aware of what's going on with Fumi and that she is aware of time travelers manipulating events.
I also strongly suspect that Saitou is somehow a descendant of Ichika.