Kateikyoushi x Saimin 2 - Episode - Season 1

Masato endures ongoing harassment and physical abuse from his private tutors, the Shinjo sisters. After reaching a state of mental and physical exhaustion, he is approached by Sakiko, the proprietor of a mysterious establishment known as 'Gentil Donna.' She provides him with a device capable of imposing mental control. Using this device, Masato first subdues Serina, subjecting her to sexual abuse. Once finished, he compels her to assist in entrapping her sister, Haruna, who becomes his next target for manipulation.