人妻　～悦縛の宴～ (2008)

When she learns that her husband's company is in danger of going under, dedicated housewife Sonoe desperately searches for a way to save his business -- a quest that eventually leads her to seek the counsel of his rival, Tsuyama. After agreeing to accompany Tsuyama to an S&M sex den, the straitlaced Sonoe finds herself entangled in a fetishistic world replete with scintillating secrets and dangerous desires.