Emi (Haruna Osaka) married her husband Koichi three years ago and has been living a happy life. One day, she decided to move into her company housing at the suggestion of her husband's company. While her husband is away, Emi accidentally finds out about her secret staircase. It leads to the room of Koichi's boss, Tashiro, who lives above her. She is found by Tashiro and she is reprimanded. Emi is threatened and raped. She escalates Tashiro's sexual demands. Emi was swallowed by her vortex of lust that she could not escape.
