Yugo, a high school student, is deeply and obsessively in love with his classmate Shiina. He has witnessed her death countless times, each tragedy pushing him further into despair. In response to his relentless devotion, a divine power grants him a magical gun that allows him to transcend space and time. Each time he pulls the trigger, he resets reality to a point before Shiina’s untimely death, giving him another chance to save her. However, this power comes with a devastating cost: every reset erases a portion of Shiina’s memories of him, gradually making her forget who he is.

The setting is a modern-day Japanese high school and its surrounding town, where everyday life contrasts sharply with the repetitive, life-threatening dangers Shiina faces. The central conflict is not only about preventing her physical death but also about preserving the emotional connection between them. Yugo’s goal is not just to keep Shiina alive but to reach the one irrefutable proof of love he seeks: a kiss from her. He burns every failure into his mind, his sanity slowly chipping away as saving her becomes his sole reason for living. His love borders on unhealthy obsession, and the story explores the psychological toll of watching a loved one die repeatedly.

As Yugo cycles through countless resets, Shiina’s memories fade one by one, making each new timeline more difficult than the last. He must find ways to protect her without the benefit of their shared history, all while his own mental state deteriorates. In the final narrative arc, a death goddess and a love goddess intervene, revealing a new condition: Yugo and Shiina can live equal lifespans if they achieve a form of union. The conclusion is ambiguous and bittersweet. Yugo and Shiina ultimately meet again later in life, their fates bound together despite the erasure of their memories. The gods hint at having gone too far with their interference, leaving the couple to live out their days together, the cost of Yugo’s many sacrifices finally paid.