A forced master-servant relationship between a demon and a human girl! Despite being compared to her smart younger sister, Shiroki Mizore strives to meet her mother's expectations by aiming to get the top spot at her prestigious school. Yet, no matter how hard she tries, she still feels she’s never acknowledged. One night, overwhelmed and at her breaking point, she finds herself lost in another world and suffers a life-threatening injury. In her desperation, it's her troublesome senior, Mayoi Yuraku, who saves her. However, the price of being saved by her demonic senior is a forced master-servant bond and a shocking adult kiss!