Ninamori is one of Naota’s schoolmates. Her father, who happens to be the mayor, has been accused of having an affair with his secretary. Ninamori has also put Naota unwillingly into the lead role of the school play. Naota has even weirder shapes coming out of his head!
The father of Naota's classmate, Eri Ninamori, who is also the mayor of Mabase, is caught up in a scandal involving an alleged separation with her mother. Ninamori is more focused on the class' upcoming play, Puss in Boots, in which she plays the lead opposite Naota, who was voted to play the cat. Naota is unenthusiastic about his casting and skips the day's rehearsal. Upon meeting with Mamimi, she discovers that he now has cat ears growing from his head. Ninamori retreats to a train station to get away from the media circus that has developed outside her home, where Naota finds her. Haruko comes racing down the street, and falls off her Vespa when she swerves to avoid hitting a cat. The Vespa slams into Naota, knocking him into Ninamori and revealing his cat ears to her.
Kamon invites her to spend the night at the Nandaba residence due to the current turmoil at her home, and while in Naota's room, she reveals that she rigged the class votes to have him cast as the cat and herself as the Marquis. The next day, the two get into an argument over the play. After Ninamori angrily reveals Naota's cat ears, he retaliates by revealing her vote rigging. This triggers the emergence of a massive creature from her head, which Haruko and Canti manage to defeat with the help of curry. The class goes through with the play.
Opening song: Instant Music
Ninamori sees Kamon at store: Sad Sad Kiddie
Haruko causes car-wreck: Runners High
Curry Dinner: Selfish
Ninamori washing: Carnival
Ninamori sitting on Naota’s bed: Stalker
Ninamori’s robot: Advice
Robot chases Canti: Yorii Gallop
Canti eats Naota: Little Busters