I gotta be honest, I'm not really a fan of Kase's attitude here. It reeks of this "I told you so" smugness (especially when she's asking shit like "do you really want friends that badly") when there was really nothing wrong with what Yamada was doing.
Well, whatever, but remember, Kase had not yet met Hana-chan when she said that, so from her point of view, Yamada was going along with some dodgy new friend who was dragging Yamada along to a sleazebag mixer. Hence her relief when she discovered that Hana was just about as worldly, decadent, and sophisticated as Yamada (Hana really needs to develop a head sprout herself).
This is just another one of those mutual misunderstandings because they adore each other so much and also because they're actually in a kind of long-distance relationship--it makes no more sense from Kase's POV that Yamada would be jealous of Snippy the Jock Roommate than it does from Yamada's to think that Hana is some gyaru leading Yamada into a life of boy-related sin.
EDIT: The "you're mine" thing may or may not be a real long-term problem, but in this case Kase is rescuing Yamada from a den of sleazebag BOYS who are trying to PICK UP YAMADA.
That is the very definition of Not OK.
last edited at Feb 21, 2019 2:22PM