Kure-nai

Shinkurou Kurenai is a 16-year-old who balances school life with an unusual nighttime job as a dispute mediator. Though he looks unremarkable, he’s a skilled fighter with an odd supernatural ability. One of his assignments sends him to live with Murasaki Kuhouin, a seven-year-old girl from a powerful family, as her bodyguard. She fled her home under mysterious conditions, and now Shinkurou must protect her while uncovering the truth behind her escape.