In a historical setting, Himura Yuu, a dedicated student at Otowa Academy, is shaken when he encounters a enigmatic girl named Amamiya Yuuko who holds a connection to his past. This unexpected reunion unearths long-buried memories and emotions, challenging Yuu to confront his deep-seated regrets. Meanwhile, Kuze Shuuichi, initially perceived as a flirtatious man, reveals a desire for solitude. When Hayama Mizuki, captivated by his violin playing, seeks to break through his walls, Kuze resists her efforts, setting the stage for a complex and foreboding romance marred by looming tragedy.