Okusama ga Seito Kaichou! S02E10 - The President and Disciplinary Committee Head's Troubles

At school Rin, Karin and Honoka talked to Kei, that Ui has good test scores. Then Kei told a story as Rin and Karin ran out of the room. When Honoka stayed behind and Ui was walking down the hallway, Rin asked her a question. Later they were buying something for Hayato; but really they were trying some new clothes.