Just so you know...those people are Hajime Hinata, Fuyuhiko Kuzuryu, and Peko Pekoyama.

[ and natsumi kuzuryu, but she hasn't figured out fuyuhiko's sister is around yet. she feels like sync may as well know in advance who else is from her world, although she doubts he'd really do anything with the knowledge. ]

It's true that not everyone really seems like they'll adapt that easily...but then, it did take a lot of the others time to accept our worlds being gone, too. It's a lot to ask of anyone.