Shinkurou Kurenai is both a high school student and a dispute mediator at night. Despite his gentle nature due to his past experiences, he has honed his skills for survival. Now, despite appearing unassuming, he possesses great strength as a martial artist and an unusual ability. One of his assignments takes him to live with Murasaki Kuhouin as her bodyguard. Murasaki is the seven-year-old daughter of a wealthy family who escaped their home under mysterious circumstances with Benikas help. She finds common life strange, but through interactions with her neighbors, she becomes more accustomed and loses her snobbish behavior, growing fond of Shinkurou. Although many details about his job are unclear, Shinkurou remains committed to protecting Murasaki. However, he lacks knowledge about the true threat targeting her.