Having grown up in an ordinary household, Junko married Hiro, the eldest son of the wealthy Kurihara family, beginning a new life. However, she gradually lost her confidence due to the harsh treatment from her sister-in-law, Hiromi. The only person who offered her emotional support was her kind and gentle father-in-law, Yuichiro. One day, when Junko went out to help him with some chores at his request, she was shocked to find his once-warm demeanor suddenly turn cold and cruel. He violently assaulted her. Soon after, Hiromi arrived and forced Junko into further humiliating acts. Amidst this torment, something dark began to stir within Junko's heart.