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 X finally face off! Although Sakamoto has vowed not to kill, X shakes him up by threatening his family. How will Sakamoto fare when confronted with an enemy who has a bloodthirsty grudge against the JAA?!