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Enjoji and Ranmaru have been close friends since they bumped into each other on the first day of school. Having shared an intimate moment after an intense kendo match, their relationship moved to the next level and the pair now live together. However, now that he's taken a job at a local host club, Enjoji has started staying out late, coming home drunk and acting suspicious, making Ranmaru more than a little insecure about their future. As a final straw, Ranmaru finds lipstick on Enjoji's chest, flying into a rage and storming out of the house. Is the pair's relationship over, or will reminiscing about the past bring the two closer together than ever?
College student Misaki Takahashi's feelings towards famous novelist Akihiko Usami gradually changes with time being living with him, especially when Misaki is becoming a college senior.
Class president Seung-taek is the only person who ignores the troublemaker Gyu-bin. They belong to whole different world and they seem like they can’t get along at all. However, once they enter Gyu-bin’s house after school, their relationship changes strangely…
The OVA is divided into three separate stories. The first one is called "Junjou Egoist" and relates to the couple Kamijou Hiroki and Kusama Nowaki who are taking a trip on the Shindai train. The second one is called "Junjou Terrorist" and relates to the couple Miyagi You and Takatsuki Shinobu who are having difficulty accepting the age gap between them. And the last one is called "Junjou Romantica" and relates to the couple Usami Akihiko and Takahashi Misaki who are remembering the early days when Usami tutored Takahashi for his entrance college exams.
Misaki has made his way to attending a university, and continues to live with distinguished author Akihiko – a man who is persistent as ever in pursuing a relationship with Misaki. However, with Akihiko's editor insisting that Misaki keeps his distance to avoid scandals and Misaki’s stubbornness in full force, it’s difficult for the boy to admit his feelings to his benefactor. As if things couldn't be more complicated, the arrival of Haruhiko, Akihiko’s brother, throws yet another wrench in the gears. With Haruhiko now showering Misaki with gifts and Misaki's indecision on the rise, will Akihiko and Misaki finally see their relationship to flourish?
Fooled into coming overseas by news of his mother's imminent death, high school student Kaido Haru encounters a boy who insists that he's his brother. Haru does his best to raise feral and obstinate Ren, but there seems to be a secret behind Ren's birth. On top of that, just when Ren begins to warm up to Haru, tragedy strikes. Five years later, Haru reunites with Ren, all grown up in Tokyo, but…