Momo and Okarun enlist Mémé-Turbo in an infiltration mission at the police station. Her investigation aims to discover the identity of the person who came to retrieve the golden ball, but her lack of computer skills causes the operation to fail... As the two high school students think of a backup plan, they run into Rokurô the Serpent, who agrees to lend them a hand. With his help, they now have a name!