High school sisters Noka and Hinano lived harmoniously with their stepfather Yoshio in the countryside. However, one day, their stepfather passed away, and the person who took care of them was their stepbrother Hiroshi, who had returned from the city. Hiroshi initially acts kindly, but his gaze towards the sisters gradually fills with desire, beginning a malicious domination. Noka desperately endures to protect her sister, while Hinano is crushed by fear yet clings to her sister. However, Hiroshi's abuse escalated, and eventually he brought a rich man home and forced the sisters to sell their bodies. Trapped in the dark house with no way out, they supported each other while trying to survive with a faint hope. Behind the sisters holding hands in front of the Buddhist altar, there loomed the shadow of Hiroshi that would never fade.
