Akari, the private tutor, was spending her days teaching Kota Muraoka, the second son of the Muraoka family. However, one day she accidentally laid eyes on a room they called "the room you must never look into"—a place harboring the family's dark secret. This room belonged to Kota's father, Naoya, who used it to dominate women, and Akari suddenly found herself in grave danger. When the eldest son, Sota, discovered this secret, Akari's fate took a twisted turn as the story plunged into depravity, domination, and sexual slavery.