As Yuma just begins to realize that he has been coming to school in bizarre outfits for a week, he learns from Astral that a cat-like thief has been sneaking into his room at night. The next day, Yuma gets word that Tori has allegedly been kidnapped and goes to a mansion where he meets Cathy "Cat" Katherine, a cat lover, who challenges him to the duel. As he fights against her, Cat admits she often feels ignored in class and tries to confess some feelings to Yuma, but he is too focused on the duel, which he wins. He later learns that Tori hadn't been kidnapped after all, but was just playing with her cats.