​A private tutor named Hiroko arrives at a beautiful mansion to teach Yuki, a young girl. However, Hiroko’s world takes a twisted turn when she suddenly falls unconscious after drinking tea offered by Shizuka, Yuki’s sister. As Hiroko regains consciousness, she finds herself naked and tied to a bed, unable to escape. Yuki and Shizuka take advantage of Hiroko, subjecting her to sexual molestation using sex toys and engaging in various explicit acts. In the midst of this debauchery, a shocking family secret is unveiled, leaving Hiroko stunned. Will she be able to defend herself against the sisters’ relentless desires, or is she doomed to be their living sex toy forever? Brace yourself for a thrilling and explicit journey filled with unimaginable pleasures and sinister twists.​