Tooru Kirishima, infamous as 'The Demon of Sakuragi' in the criminal underworld, faces a daunting task from his boss after a near-disastrous incident: caring for Yaeka Sakuragi, the boss' seven-year-old daughter. This unexpected responsibility forces Tooru to grapple with unfamiliar emotions and challenges as he navigates a new role. Initially at odds due to their communication barriers and emotional disconnect, Tooru and Yaeka gradually forge a unique bond, transcending their differences. Through this unlikely pairing, the tough enforcer and the vulnerable child discover that family bonds can transcend blood ties, revealing profound lessons about responsibility and connection.