Fuko the veterinarian encounters the much talked about leopard mask in Kamihama City, and comes to believe that the face of the leopard mask is that of a real animal. With Haruka's permission, the Kirumin set out to solve the mystery, but Riko and Ken are acting differently than usual. Meanwhile, in the Hattori household, the new leader of the Fang Clan, Jii, has gone missing! Will the Kirumin be able to uncover the true identity of the Leopard Mask?