Billionaire Kaneda Kanesuke reveals he is the brother of Kösaku's mother, Harue. Hibari and Kösaku fly to Kaneda's mansion to meet him, just in time for the thief, Phantom Thief Mouse Kid, to warn Kaneda he plans to steal his favourite statue, Thinking White Alligator. Ibari and Seiji arrive, having been worried about Kösaku, and Ibari clashes with Kaneda who wants to take Kösaku to America. While guarding the statue they are knocked out by sleeping gas. Kaneda reveals he is Phantom Thief Mouse Kid, and he wanted to see if Kösaku had potential to become a thief, but decides Kösaku is a disappointment...