A gentle and patient 16-year-old student by day, Shinkurou Kurenai provides dispute mediation by night. Yet despite his unassuming looks, his painful past has led him to become a highly skilled fighter with a mysterious power. Tasked by his employer, Benika Juuzawa, to act as a bodyguard for Murasaki Kuhouin, a wealthy 7-year-old girl who fled her influential family under dubious circumstances, Shinkurou must cautiously navigate a cloud of secrecy surrounding their assignment. As Murasaki initially struggles to adjust to life outside of her sheltered world, Shinkurou's solemn dedication to safeguarding her never falters, even though the threat remains unknown.