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?!

When X's forces attack the JCC, all hell breaks loose! While Satoda Sensei faces off with Kanaguri to protect the students, Sakamoto and Shin rush to secure Amane's grandfather. But the whole situation gets even more hairy when Club Jam hypnotizes the entire school!