無神 ルキ

Ruki Mukami is the eldest son of the Mukami household. He is known as the 'Brains' of the Mukami family.He always has an intimidating smirk on his face matched with a calm tone, but a sense of brutality can be felt in his spoken words. Without dirtying his own hands, he interacts with others as a cruel-hearted, military do-S (extreme sadist). Ayato notes that he is an "intellectual" person.