Taro Sakamoto was once the most feared and legendary assassin in the underworld, a mythical hitman so lethal he was considered a god among killers. However, his life underwent a drastic transformation when he fell in love with a
convenience store clerk named Aoi. Choosing domestic bliss over bloodshed, Sakamoto walked away from the syndicate, married Aoi, and started a family. Years later, he runs a quiet neighborhood convenience store, having gained a significant amount of weight and lost his razor-sharp edge, yet remaining fiercely content with his peaceful, ordinary existence.This fragile tranquility shatters when his past catches up to him. A bounty is placed on his head, drawing a parade of eccentric assassins to his doorstep. To protect his wife, daughter, and store, Sakamoto must dust off his lethal skills, though he operates under a strict personal vow never to kill anyone again. His first major encounter is with Shin, a telepathic hitman originally sent by Sakamoto’s former
crime syndicate to eliminate him. Impressed by Sakamoto’s sheer power and inspired by his humanity, Shin switches sides, becoming Sakamoto’s loyal employee, surrogate sidekick, and protector against incoming threats.As the narrative unfolds, the duo transforms the convenience store into a revolving door for bizarre mercenaries, reformed killers, and dangerous crime lords. They are soon joined by Lu Xiaotao, a former mafia heir with a penchant for alcohol and martial arts. Together, this makeshift family navigates a chaotic double life, balancing mundane chores like restocking shelves and managing local neighborhood disputes with dodging sniper fire, dismantling international cartels, and fighting off waves of psychopathic hitmen.The central dramatic tension escalates when the Order—the elite enforcement arm of the Japan Assassins' Association (JAA)—takes notice of Sakamoto’s refusal to return to the fold. Led by formidable fighters like the cold-blooded Nagumo and the eccentric swordmaster Uzuki, who harbors a deeply personal and tragic connection to Sakamoto’s past, the syndicate views Sakamoto’s peaceful retirement as an unforgivable betrayal. Uzuki orchestrates a massive conspiracy to destabilize the JAA, dragging Sakamoto and his friends into a sprawling, high-stakes turf war.Throughout these escalating battles, Sakamoto must continually rely on his terrifying reflexes, everyday store items transformed into deadly weapons, and the unwavering support of his quirky allies. The overarching plot is a high-octane collision between domestic comedy and brutal action, driven by Sakamoto’s steadfast motivation: to prove that love and family are infinitely more powerful than the darkest underworld, and that a former monster can truly change his ways without losing the strength needed to protect those he cherishes most against impossible odds.