Trained as a ruthless assassin since childhood, a mob hitman is ordered to become a normal law-abiding citizen.

Equipped with his favorite weapon, an anthracite-colored Nighthawk pistol, "Fable" is a professional killer feared by all the Japanese underworld, politicians, mobsters and public figures. This assassination genius can send any of his targets six feet under and in six seconds, if his heart tells him. One day, his sponsor orders him to put everything on hold and lead the life of an ordinary citizen, in the hideout of a yakuza clan in Osaka, ban on killing or attacking anyone for an entire year. For this human weapon with an unpredictable temperament, surrounded by trigger-happy criminals, the hardest contract begins.