I'm pretty sure he was with them when they all went missing, In one of the chapters you can see them as small kids and in the corner you also see a small part of black hair with cat boy looking that way. Probably also the reason he got into that class (=・ω・=)
Chapter 4 page 17
Yeah, Atoi once said the hometown reminded him of sea. But, when he arrived, there's only mountain. I think Atoi did go with the others, but somehow he might forget or not realize that he was one of them. I want to know more about his past & co
I agree with ya guys...
Like what if his form is the "secret" that they all are keeping?
... but he's super fast... hmm... I want to know what his animal form is!
I think there's more to look into his childhood...