Rinka tries to save her friend Yui from being raped by the poolside, but Demura-sensei suddenly appears and stuns her with a stun gun. Still dazed, Rinka hears a familiar voice. She regains consciousness and the scene of Konomi being raped by Demura-sensei fills her vision. Rinka tries to save Konomi, but her body won’t move because her arms and legs are restrained. Demura-sensei grows bored of using Konomi’s body, and he approaches Rinka. Rinka gives him a defiant stare and tries to resist, but this only turns Demura-sensei on even more.

A school where having sex replaces a normal grading system. The one at the top of the sex list gets the grades.