Rena wrote Kaede's name on the Friendship Ending Staircase. Kaede apologizes to Rena, but she is kidnapped by the Chain Monsters, confirming that the rumor about the staircase was true. In order to find Kaede and bring her back, Momoko and her companions come up with a strategy to lure out the Chain Monsters. Yachiyo has joined the group after being asked by Momoko to help them. Yachiyo claims that Iroha will hinder the operation and refuses to let her participate in the battle with the Chain Monsters.

Iroha moves into Mikazuki Villa and transfers to Kamihama City University Affiliated School. She discovers that even though Kaede goes to the same school, she is unable to contact her. Iroha has a hard time getting used to her new surroundings, so when she sees that Rena doesn't have many friends in class, they decide to eat lunch together on the rooftop. Iroha is still gathering information about various rumors, and Rena tells her about the rumor of the Invisible Girl and Endless Solitude. Tsuruno hears about the rumor of the Radio Wave Girl from a regular at Banbanzai and tells Iroha about it.