Nishina is a high school boy with no real friends, who has spent months quietly observing Ichimiya Misumi, the girl who sits next to him in class. To everyone else, Ichimiya appears to be a lonely, unremarkable girl without any special appeal. But Nishina alone knows a different side of her: a provocative and alluring side that she keeps hidden from the rest of the world. When Ichimiya becomes aware that Nishina is watching her, she begins to engage with him in her own unique and teasing way, drawing him into a secret, two-sided game of glances and small interactions.

As their dynamic deepens, it becomes clear that Ichimiya is carrying a secret of her own. Unbeknownst to Nishina, her private life is entangled with a controlling, narcissistic older brother whose presence looms over her. The story unfolds as Nishina and Ichimiya navigate their unusual bond, caught between genuine connection and the darker currents of obsession, manipulation, and family dysfunction. Set entirely within a modern Japanese high school, the narrative arcs from a voyeuristic fascination into a complex, often uncomfortable exploration of desire, secrecy, and the blurred lines between observer and participant. Over the course of the manga, the relationship is tested by the brother’s interference, leading to conflicts that force both characters to confront the truths they have been hiding.