A young man named Takeru finds his ordinary high school life disrupted when he attends a class reunion and comes face to face with Marika, a girl he has not seen since their elementary school days. As a child, Takeru was fascinated by Marika, who always seemed different from the other students in a way he could never quite understand. Now, years later, seeing her again stirs those powerful childhood memories, forcing him to confront the feelings he first experienced back then.

The mystery at the heart of his lingering confusion is that Marika is not an ordinary girl. She is the reincarnation of Takae, a woman who died young and was reborn into a new life. While her body is that of a growing student, her core identity retains the memories and maturity of a forty-year-old woman. This unique circumstance shapes the narrative, as Takeru’s innocent first love becomes entangled with the secret of Marika’s true identity. The spinoff recontextualizes characters and events from the original story, Tsuma, Shōgakusei ni Naru, shifting the focus away from the married couple to explore the perspective of those who knew the reincarnated wife in her daily life.