Some atavistic monsters that intercourse with humans during their ancestral period are easily despised, disgusted, and even killed by pure-blooded monsters. Therefore, this high-end apartment, commonly known as [Monster Hall], is a place rented by atavistic monsters. In order to guard against attacks by other pure-blood monsters, tenants renting in the "monster house" must also be guarded by a guard named SS. In addition to protecting the owner's safety, these SS will also manage the owner's daily life like butlers. The heroine of this work, Shirogeiin Rinlindie, is the daughter of the wealthy conglomerate Shirogeiin, but she has been bullied by her classmates since she was a child because of her prominent family background. Although some adults will lend a helping hand to her, they are all eager to help because of her family background. This also hurts Rinlindie invisibly, making her realize that her existence is not important and insignificant. For this reason, Linlindie has developed the habit of always bluffing meaninglessly and speaking sarcastically since she was a child. As a result, things got worse and worse, and she eventually started to hate herself. In order to change this life determined by her family background, Lin Lindie decided to leave the White Ghost Institute and move to the "Demon Mansion" alone, where waiting for her exclusive SS Yuhushen Shuangchi, unexpectedly turned out to be a loyal dog. In this way, the pair of masters and servants, Linlindie and Shuangchi, will start a new life in the "demon hall".