Summary
Masato is subjected to harassment and abuse by the Shinjo sisters, two older ladies employed as his private instructors. Fatigued both physically and mentally by the two sisters, he obtains assistance from Sakiko, the proprietor of an enigmatic establishment known as ‘Gentil Donna.’ The woman provides him with a mind control gadget intended for him to exact revenge on his educators. Initially, he exerts control over Serina, and once concluding his sexual exploitation of her, he coerces her into ensnaring his subsequent target, her sister Haruna.