Carbonic acid hot springs aren't too hot, so you can stay in them a long time. Natsusa and the others reconcile after discovering the cause of Seiichiro's ill health. Gakuju joins in and enjoys a moment of off in the midst of the great crowd. After enjoying the hot springs unique to Oita, Natsusa and the others decide to stay at their parents' house. Natsusa and Ibuki stay at Seiichiro's parents' house, and Yu stays at Yasuya's parents' house. There is no reason why nothing will happen there...? After Ibuki returns to Oita, her mother shows up. Meanwhile, Kotori, a first-year student, continues to train hard in place of Takumi, who is desperate to participate in the Kofuin match...