Yellow fellow teacher and mops?.Ken met a cat that looked like a mop, and when he touched it, he saw something that looked like a yellow monster. Riko and her friends, who also encountered the same cat, heard a similar story from Haruka's mom and started searching with the Kirumin to uncover the monster's true identity. At the same time, Kirino, an Animalian who is working with Kanon, goes missing...