Tarou Sakamoto was revered as the ultimate assassin who dominated the underworld with his commanding presence. However, his life took an unexpected turn when he fell in love. In a bid to start afresh, he bid farewell to his criminal ways and settled down as a humble store clerk.
Though Sakamoto was intent on leading a reformed life, his unsavory past continued to haunt him. He was relentlessly hounded by his former foes and accomplices, who were skeptical about his transformation and constantly threatened to derail his progress. The situation left Sakamoto stranded- he was unable to resort to his old ways of dealing with danger and was forced to rely on his wit and cunning to safeguard himself, his loved ones and the society he had come to cherish.