The Challenge of the Phantom Thief, Nezumi Kid.The Daimaō orders Sorges to defeat Chacha again, and Sorges asks why he is so interested in Chacha, but gets no answer. Meanwhile, Chacha and her classmates are graduating, but the Nezumi Kid has announced his intention to steal the Graduation Stamp, thereby preventing the students from graduating. It turns out that Nezumi Kid attended the school the same year as Seravy and Dorothy, and left the school after losing a disguise contest to Seravy...