Rito Yuuki expects another normal day at school until Lala Satalin Deviluke shows up with her latest creation, a robotic cat that can clone things, which she wants to show him. A careless touch of the device sets things off, and Rito starts multiplying uncontrollably, flooding the hallways with copies of himself. The only fix is grabbing the cat by its tail, but the gadget is too quick and slippery to pin down easily. As the clone count climbs and the school descends into chaos, the question becomes whether Rito's crowd of doubles can catch the thing before the whole planet gets overrun by endless versions of him. Built around a simple sci-fi gimmick and played for slapstick and fan service, this single-episode OVA came packaged with a book celebrating the franchise's tenth anniversary.