Something's happening in the vault of Ariga Chemicals, which is rumored to be draining sewage. There's a card with a black leopard mark leading to someone called "Phantom Thief Lady Panther"! Ken, who happened to come to the residence of the president of Ariga Chemical, heard that the large amount of meat delivered there was food for the president's pet, and started investigating the relationship between that and the missing pet incidents that occurred in the neighborhood recently...