Sixteen-year-old Shinkurou Kurenai makes his living settling disputes between people who'd rather not involve the police, a skill sharpened after losing his family in a terrorist attack as a child. His latest job pulls him in deeper than usual: serving as live-in bodyguard for Murasaki Kuhouin, the young daughter of one of the country's wealthiest families. The light novel follows Shinkurou navigating that arrangement alongside the daily chaos of raising a child not his own.