Based on the erotic game by Liquid. 
 
The Azuma family is a feminine family and their eldest daughter, Haruka, is the headmistress of St. Orchis Academy, while their second daughter Suzuna is the student council president and their youngest daughters, the twins Himari and Komari, are enrolled in the school. Originally an all-girls school, the few male students at this school were unfairly discriminated against. Cornered by the family's oppressive rule, the male students rose up and humiliated and raped Himari and Komari one after another. This leads Kei Kuga to trap the headmaster, Haruka, and take full control of the school. The boys resentment is directed at the Azuma sisters and they are exposed to the vomit of lust.

Based on the erotic game by Liquid. 
 
St. Orkis Private Academy, located in a remote mountainous area, is a boarding school run by the Azuma family, a female-headed family. Tsugumi Kusakabe, vice president of the student council, and Suzuna Azuma, the second daughter of the current head of the family and student council president, greet a male transfer student, Kei Kuga. Tsugumi is wary of Kei when she first meets him, but Suzuna, a good-natured girl, immediately takes an interest in him simply because she has known him since childhood, and adds him to the student council. Since then, the school has been changing under the radar, as Asami Rokudou, a troubled student, improves her behavior and the egomaniacal and unrestrained twins of the Azuma family become more obedient. Even Tsugumi, who had been distrustful of Kei's behavior, is forced to lose her virginity when he takes advantage of her weakness. Tsugumi learns that even Suzuna has been raped by Kei, who soon reveals his true nature, and that she has been reduced to the humiliating position of a sex worker. 
 
(Source: parabook, translated)

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