Hideo Aiba is anything but popular. Not only is he a high school virgin, he's also a part of the "Roman Club" – a group of guys with bizarre fetishes. But Hideo's unusual school life is changed forever when the mysterious Kurumi transfers into his class, joining the Roman Cub soon thereafter. Together, the two begin a strained and pleasurable relationship where Kurumi controls Hideo's very desires... and actions.
Nana and Kaoru are now seniors in high school, still enjoying every minute of their secretive S&M sessions together to blow off steam. The fun continues for the pair when the two are invited to a special trip with adult toy shop owner Mitsuko and her 'master' – a man who just happens to be Shuutarou Sarashina, Kaoru's idol! What will Nana and Kaoru learn while under the tutelage of Sarashina-sensei and his lovely submissive?
Every day after school, the quiet and introverted student Kurosawa goes into the empty girls bathroom and "relieves himself". Besides this extremely odd ritual, Kurosawa also has a thirst for justice and a judgmental attitude towards his classmates. Upon seeing the bullying of an awkward girl in his class by two of the "popular" girls, he decides to bring justice to the bullies the only way he knows how. His plan for revenge goes "just as planned" until met by an unsuspected accomplice.
Onani Master lacks Sundome's nearly-nonstop and over-the-top ecchi, but both are coming of age stories about nerdy anti-social guys, cute popular girls, and masturbation. Fans of one may enjoy the other (especially Sundome -> Onani Master. Some Onani Master fans may not be down for all the fetish-y ecchi of Sundome).
While performing a delivery to a beautiful woman’s apartment one night, twenty-five-year-old Kimijima finds himself in the arms – and loins – of his customer, the newly-divorced Kana-san. The next morning Kimijima heads to an interview, only to find that one of his interviewers is Kana-san herself! Now, Kimijima must work hard at his new job while having ample sexual encounters with not only Kana, but hostesses, fellow interviewees and old friends (at least in his dreams) - to say the least! However, to make things more complicated, Kimijima finds himself falling for Kana...