Sixteen-year-old Shinkurou Kurenai specializes in settling disputes that never reach the police, and his newest client is Murasaki Kuhouin, the seven-year-old daughter of a powerful family who needs a live-in bodyguard. Taking the job puts a sheltered heiress in his cramped apartment and turns his working life into a daily balancing act between fieldwork and unexpected childcare. Action and household comedy carry roughly equal weight across the manga's ten volumes.