With the loss of the class chairman Andou Miyako to electrocution and classmate Manaka Nemu's deflowering in bondage play, protagonist Takutou Keisuke now chooses childhood friend Hokari Kanae as the next "keyhole" to "unlock". What he doesn't know is the hellish play that will unfold.

The depravity of each progressive game unfolds a lurking dark desire in Takutou Keisuke as the other ladies watch him employs scat play, nose hooks, and electric shock play.

Will protagonist Takutou Keisuke be able to satisfy his desire to humiliate and dominate his childhood friend Hokari Kanae?