Maou no Keifu

Touya Takatsukasa was twelve when he was kidnapped and violently assaulted. All those who took him were later found dead near him. Since that time, his father has entered his room at night, and for six years, Touya has not stepped outside his home. Rumors suggest his father made a deal with a demon for power and riches. Now that Touya is an adult, his father insists he leave the house and assigns him a bodyguard named Kuroha Kazuomi, who shows unusual dedication.