That's all true, I don't dispute that, all I'm trying to say is that you could replace "we had a secret sleepover because the world is in an infinite loop" with literally any other reason, or possibly just pretend you don't know why it took place (she only came for food and she bailed, anyway) Not only does that get around Chika repeating herself, but any lie you could make up would probably be more convincing. If someone told me they secretly hung out with my boyfriend to discuss the apocalypse, I'd be like wow, you couldn't find a better excuse while he was inside you? But since she'll ignore it and repeat herself anyway, it at least gives Yumi time to come up with a better explanation, so it may even help her talk Chika down in a weird way