Yachiyo and Kuroe are imprisoned by Iroha's Doppel and end up in a world made of Iroha's fantasies, where everyone knows each other but only Ui is represented as a stuffed bear. As Yachiyo searches for a way to destroy the Doppel, Kuroe spends time in Iroha's fantasies conversing with what appears to be the real Iroha. They soon both discover that the Doppel has been hiding inside Iroha herself, creating a fantasy world and a new sister to overwrite the nightmares Iroha had been having...