Misaki Takahashi, a high school student, is shocked to discover his brother in a compromising situation with Akihiko Usami, a renowned author and his brother's close friend. As Misaki and Akihiko's relationship evolves into a tutor-student dynamic, Misaki grapples with conflicting emotions upon stumbling upon one of Akihiko's boys-love novels. Meanwhile, university professor Hiroki Kamijou, reeling from a failed love affair, reluctantly aids student Nowaki Kusama in his studies, leading to unexpected revelations. In a separate tale, wealthy teen Shinobu Takatsuki pursues Hiroki's colleague, You Miyagi, driven by a past rescue and unrequited love. 'Junjou Romantica' weaves together these distinct love stories, delving into the intricacies of each couple's romantic journey.