Nobuo Matsuri was raised to be a deadly weapon, inheriting the powerful legacy of the Matsuri Shinobi clan. For his entire life, he was consumed by the study of swordsmanship - until the day he fell madly in love. But as the years have gone by, Nobuo's fortunes have taken a turn for the worse. Now in his thirties, he struggles as an unattractive salaryman, beset by bullying coworkers, familial obligations, and a pervasive sense of failure. And to make matters worse, his old clan continues to send assassins to hunt him down, furious that he has abandoned their ways and led his life astray. Luckily, Nobuo still commands the skills of ninjutsu, the art of deception.