"Sakamoto Days" centers on Taro Sakamoto, a former legendary hitman who retires from his life of crime to start a family and live a peaceful existence. After marrying and having a child, Sakamoto opens a convenience store, leaving his violent past behind. However, his tranquil life is disrupted when his former associates and enemies from the underworld begin to resurface, forcing him to confront his past. Despite his desire to avoid violence, Sakamoto’s unparalleled combat skills and quick thinking make him a formidable opponent, even in his seemingly ordinary life.

The narrative explores Sakamoto’s dual identity as a devoted family man and a retired assassin. His past catches up to him when a bounty is placed on his head, drawing the attention of assassins and mercenaries eager to claim the reward. Sakamoto’s ability to neutralize threats with creativity and humor, often using everyday objects as weapons, becomes a defining trait. His former colleague, Shin, a skilled assassin with a calm demeanor, becomes a key ally, assisting Sakamoto in protecting his family and store.

The series introduces a diverse cast of characters, including rival assassins, each with unique abilities and motivations. Among them is Lu, a young and ambitious assassin who initially seeks to defeat Sakamoto but later forms a complex relationship with him. The story balances action-packed sequences with moments of humor and heart, as Sakamoto navigates the challenges of maintaining his peaceful life while fending off relentless adversaries. Themes of redemption, loyalty, and the consequences of one’s past are woven throughout the narrative, creating a compelling blend of action and character-driven storytelling.