[ it tru ]

I do not think anyone forgets. Jyuto believes it's more likely we're from parallel versions of each others' worlds. It makes more sense than no one realizing we are gone because an entire world's time has been frozen while we are here.

[ Or he's just agreeing because it's Jyuto and he doesn't like the idea of forgetting. There's really no evidence of any theory being accurate, so he's selecting the one that he likes best. ]