"Ou-Ba-Come to the Bath" (Japanese: おーばーふろぉ) is an adult manga work created by Japanese manga artist かいづか, with the title of "Actually, the hard one of my brother has already entered it when I took a bath" (実は今入ってます...。 お風呂でおbrotherちゃんの硬いアレが... っ) as the title,Serialized on the electronic comic platform ComicFesta since July 24, 2017.,The single book is published and distributed by ブラスト。 The TV anime adaptation is produced by Comet and has been airing on TOKYO MX since January 2020, with a total of 8 episodes. Kazushi Sudo (voiced by Tsukudani Sashi) is a college student who rents an apartment alone and has two younger sisters who are in high school, Saine Shirakawa (voiced by Yue Minan) and Kotone Shirakawa (voiced by Kyoko Mitsu), and the relationship between the three is not harmonious. Because their mother often returned late, the two sisters often went to Kazushi's rented house to spend time. One day, Kazushi used her high-grade bathing agent without Caiyin's permission, and Caiyin was very unhappy and insisted on taking a bath, and the three of them took a bath together. Because the bathtub is too narrow, the close contact during the bath ignites their sexual desire, and Kazushi and Kotone have sex because of this.
That night, Kazuki was so horny that he wanted to have sex with Kotone again, but he got the wrong object and had sex with Aya Yin. The next day, Kazushi and Kotone have sex at school, and after Kazushi returns home, Caine asks Kazushi to explain his behavior, Kazushi says that he is lonely and apologizes for yesterday's incident, Caine accepts his apology, and the two have sex. But after that, Caiyin stopped visiting Kazushi's residence. Kotone mistakenly thinks that Caiyin's abnormality is due to the fact that she finds out about her relationship with her brother, so she takes advantage of the wine to have sex with him and asks him to be reconciled with Caiyin. At the high school athletic meet, Kazushi and Aya reconciled. Kotone, on the other hand, wants to know what Kazushi thinks of him, and says that he doesn't mind even if Kazushi has other crushes in the future, but hopes to at least maintain the current relationship with him. The relationship between the three has become better than ever.
