In Tokyo, Yuya and Sumire, a happily married couple, live with Sumire's sister, Mitsuka, a specialized student who is a guest at their home. Mitsuka is a beautiful girl who often finds herself in gaps, attracting the attention of certain individuals who entrap her into a pseudo-romantic relationship. The man playing the role of Mitsuka's boyfriend, named Hyuga, is a member of a semi-criminal organization. Along with his associates, he targets not only Mitsuka but also Sumire, eventually engaging in horrific voyeuristic sexual acts in front of Yuya. Over nine months, the sisters endure extreme humiliation, and soon...
