Sansha Mendan ~Rensa Suru Chijoku Choukyou no Gakuen~

Ryou Kawabata revels in the thrill of breaking women older than him. As a student, his targets are naturally the female teachers at his school. After several fall victim, one teacher, Yuuna Hagiura, defiantly resists and reports him, forcing the school to quietly expel him to avoid scandal. Unpunished, Ryou transfers to Jyousei Academy in a neighboring town, where he encounters Aina Hagiura, Yuuna's identical twin sister. Seeing this as a twisted gift, he sets his sights on her. Along with the seductive principal Mifuyu Kamijou, her arrogant daughter Marika, and the flawless student council president Hatsune Amagi, Ryou also discovers his already 'trained' stepsister, Narumi Takatsu, is a teacher there—now his accomplice in this game of lust on a new hunting ground.