The name Tarou Sakamoto once struck fear into every villain. No other professional hitman could match his skill, and fellow assassins held him in high regard. However, Sakamoto fell in love. Within five short years, he married, became a father, gained weight, and swapped his weapons for an apron, becoming the owner of a modest convenience store. Although Sakamoto is officially retired, he finds it difficult to shake off his past life of crime. His former partner, Shin Asakura, reappears and decides to live with Sakamoto's family, adhering to their strict no-kill rule. To make matters worse, a large bounty is placed on Sakamoto's head. Numerous assassins now hunt him—but they are in for a shock. Sakamoto has not lost his edge, and regardless of the tricks his enemies employ, he will fight off every single one to protect his beloved family.