The Legendary Hit Man Taro Sakamoto was once the most feared hitman in the criminal underworld, being practically unstoppable no matter how difficult the job was. However, after encountering Aoi, a convenience store clerk, he fell in love at first sight and left the underworld to marry her. Many years later, Sakamoto has opened his own convenience store which he operates alongside Aoi and their daughter Hana, and grew overweight. One day, clairvoyant hitman Shin Asakura tracks down Sakamoto to his store, having been ordered by a gang boss to convince him to return to the underworld or kill him...