The reason Chizuru, who had been absent from school, started going back to school is because teacher Kinetsu took her virginity and forced her to submit to him.
However, once the act begins, her entire body becomes an erogenous zone, and she is unable to have proper sex with her master, Kinetsu.
One day, a frustrated Chizuru goes off to masturbate in the living room and is seen by her younger brother, Ayumu.
But instead of stopping, Chizuru pushes Ayumu down and takes his virginity.
In order to overcome her sensitivity, Chizuru decides to have sex with Ayumu.
Will Chizuru be able to successfully serve her master?