As they discuss their plans for their school festival, Yōto and Tsukiko stumble on a pink-haired girl named Emi. It occurs to them that Emi is Ponta's younger sister. Ponta then asks Yōto to take Emi on a tour at their school, which Yōto then agrees. Emi later discovers that Yōto is considered a huge pervert in their school and suddenly wishes upon her miniature cat statue to turn Yōto popular and their school more enjoyable. The outcome of Emi's wish turns their school's architecture to into ancient Rome, and the girls wear swimsuits as uniforms while addressing Yōto as "Prince".