Secretary who lets you do it: Loves sex and works overtime.

The relationship between Shimada, the president of the construction company, his adopted son-in-law and his wife Yoshimi, the chairwoman has grown cold. Shimada turns to his secretary, Kaori and tries to pressure her into a mistress contract. Her boyfriend, Tohru is seduced by Yoshimi and against her will, Kaori is transformed into a woman by Shimada...