But Momo is leaving, and Mina finds it absurd to agree that they should just wait for a few more months? years? who the hell knows. Until she answers her. Momo doesn't want to leave Mina just like that, she tells Mina that she'd be going back soon cause she knows, that Mina's yes would be waiting for her. Mina finds the idea stupid, cause answering her would give them the assurance before Momo leaves. But in the end, she agreed for it too.