Taro Sakamoto was once a legendary hit man considered the greatest of all time. Bad guys feared him! Assassins revered him! But then one day he quit, got married, and had a baby. He's now living the quiet life as the owner of a neighborhood store, but how long can Sakamoto enjoy his days of retirement before his past catches up to him?!

Sakamoto and friends are busy trying to get tickets to the Assassin Exhibition of the Century to stop Slur's terrorist plot of assassinating the JAA's chairman. To gain entry, Sakamoto puts his hopes in a black-market auction, but a ticket-buying battle breaks out with a mysterious person who's trying to obstruct him!