Being fucked in front of my husband's eyes

Emi (Aosaka Haruna) married her husband Koichi three years ago and lived a happy life. One day, my husband's company suggested that he moves to a company housing complex. While her husband is away, Emi accidentally discovers the existence of a secret staircase. It led to Tashiro's room, Koichi's boss who lives upstairs. Emi is found and blamed by Tashiro, threatened and raped. Tashiro's sexual demands escalate. Emi is swallowed up by a vortex of carnal desire that she cannot escape...