Эп. 5: Кадзуя осознаёт свои романтические чувства к Чизуру во время совместного пребывания в горячих источниках с их бабушками.

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While Kazuya is able to rescue Chizuru, he ends up in bad shape after they return to the surface. A distraught Chizuru then saves his life by performing CPR. When he is discharged from the hospital, his friends give him a ride home. At their apartment, Kazuya tells Chizuru that he already made an arrangement for next week and he will place the payment in her post box. He also apologizes to her once more for all that has happened. Inside his apartment, Kazuya realizes that he has developed romantic feelings towards Chizuru. Sometime later, Kazuya and his family head to a hot springs resort. Once they arrive there, Kazuya learns that Chizuru's grandmother is staying at the resort as well. Kazuya and Chizuru then find out they are sharing the same room thanks to their grandmothers. After they confront their grandmothers, Chizuru decides she might as well enjoy the situation. When she leaves to takes a bath, she runs into Kazuya's grandmother, who explains that it is the anniversary of her husband's passing. When she returns to her room, Chizuru enjoys herself and she allows Kazuya to stay with her. (Source: Wikipedia)