Ryoma accidentally packs his cat's [Karupin's] favorite toy in his tennis bag, so Karupin follows him to school and explores the grounds. When Ryoma finds out his cat is on campus, he rushes to find him, worried about what may become of him. After finding out that Ryoma has been relentlessly searching for his cat, the other members help him in his search, eventually helping him find Karupin. (thetvdb.com)