I feel like Mikawa has been pretty insensitive about Yamada and Kase’s relationship. I get it if she points out that the senpai was Kase’s ex. But to then get all that information and rub it into Yamada’s face when she clearly doesn’t want to know about it is kind of fucked as a friend. I wonder if Kase even really dated her before or if it was a rumor. Yamada did ask Kase if she had been to a girlfriend’s room before and she never answered and changed the subject.