The manga centers on the Saegusa household, a wealthy family living in a large estate where the father is almost always absent. In his place, the sisters of the family, particularly Shizuka and Yuki, dominate the home with a predatory and manipulative cruelty. They spend their leisure time seeking out new individuals to groom and exploit as personal playthings, treating them like pets to be trained and tormented. Beneath this surface of sadistic games lies a deeper, hidden secret that binds the family together in corruption. The narrative unfolds across a series of vignettes that explore themes of power, psychological control, and moral decay, following the sisters as they ensnare a new victim named Hiroko and subject her to their twisted rituals, while slowly exposing the dark truth that the Saegusa family works to conceal. The story is a grim portrayal of dysfunction and the abuse of power within an isolated, insular environment.