Takeru Hidaka is a high school student with ambitious plans to attend medical school. He has just begun dating his first girlfriend, Kaori Koga, and from the outside their relationship appears loving and harmonious. However, this fragile peace is shattered when Kaori's best friend, Tomoko Yoshioka, begins to openly flirt with and seduce Takeru. Torn between his loyalty to Kaori and the temptation of Tomoko's persistent advances, Takeru succumbs and enters a secret affair. He now lives a double life, juggling his girlfriend, his hidden relationship with her friend, and the pressure of his academic goals. The story follows the escalating tension as Takeru struggles to maintain the lies, knowing that exposure could destroy his relationship, his reputation, and his future. The narrative explores the boundaries of friendship, trust, and betrayal in a high school setting, driven by the dangerous triangle between the three characters.