Married woman who was tied up and raped by some of the neighbors...

Her husband's solo work trip is unbearable for Yumi, a wife in the prime of her life, and before she gets older she ends up having a relationship with another man. However, Koichi, a neighbor who secretly enjoys watching this, secretly peers and his bad friends come up with a plan... One day, Koichi visits Yumi, and without asking whether or not he is, intertwine Yumi with a special restraint and tramples her plump body. Yumi has been robbed of her freedom and is turned into a toy for evil kids, but her body and mind are eroded by days filled with humiliation and pleasure...