Also, didn’t the show up like just that one time? What happened after that? Where did they go? Did the just go back home?

It’s one of the problems I think with the last arc it didn’t explain or fill us in on basic certain things. For example the sleeping arrangements. That gets made into a big deal when Busujima shows up but it’s never shown or explained. Was it girls in one room boys in the other? If so, wouldn’t Chisa, Aina, and Busujima in the same room be something interesting to show? Was Busujima crashing with Rie? Aina made such a big deal about Iori and Chisa sharing a room it’s giving precedent that the sleeping arrangements was a big deal for one of the characters.