Emi (Haruna Adosaka) had been living a happy life with her husband Kyoichi since they married three years ago. One day, at the suggestion of Kyoichi's company, they decided to move into company housing. While Kyoichi was away, Emi accidentally discovered the existence of a secret staircase. It led to the room of Kyoichi's superior, Tadashi. Emi was caught and reprimanded by Tadashi, threatened, and ultimately raped. As Tadashi's sexual demands escalated, Emi found herself unable to escape the vortex of carnal desire...
