A middle aged salaryman named Kenji believes he has been a decent husband and father. He has worked hard, avoided infidelity, and never raised a hand to his family. Just as his children are becoming independent, he looks forward to a quiet second chapter with his wife, Ryoko. This illusion shatters when Ryoko presents him with divorce papers, her smile carrying the weight of a long awaited decision.

Blindsided, Kenji is told that his wife simply wants to be away from him. As he desperately searches his memory for a reason, he finds only a blur of long work hours and missed family moments. His daughter recalls a time she was bullied in middle school, a crisis he was absent for. His son faced educational hurdles that Kenji left entirely to his wife. The deeper Kenji digs, the more he realizes that while he was financially providing for his family, he was emotionally absent.

While wandering the streets in despair, Kenji encounters a mysterious man who offers an impossible solution: a limited number of time leaps back into his own past, but with a physical price to pay. Desperate to avoid losing his family, Kenji accepts. He returns to specific moments in his family history, trying to correct his neglectful behavior, attend his daughter's events, or simply be present. However, he quickly learns that changing one event often complicates another. He is also forced to confront a difficult question posed by the mysterious man: is he doing this for his family, or simply to erase his own shame and salvage his pride?.

As the manga progresses, Kenji uses his limited attempts to navigate the gap between his intentions and his actions. The story explores the quiet erosion of love in a marriage and the specific, often invisible, labor that his wife performed while he was at work. The narrative is set in contemporary Japan, focusing on the pressures of a traditional work culture that often alienates fathers from their children. The series remains ongoing, with Kenji struggling to understand whether changing the past is enough to fix the fundamental disconnect between him and the family he thought he knew.