Sei Dorei Gakuen 2 / School of Holy Slaves 2

 
 
St. Orchis Academy. An old school for girls founded by the well-known "Higashizuma family" in the region. Although coeducation has been introduced in recent years, the prestige of this school is not overshadowed. The daughters of the head of the Higashi family still serve as directors, and the younger daughters as students.
Everyone thought that the prosperity of the Higashizuma family, long known as a family of women, would not waver in the future. But an alarming shadow creeps into the peaceful life of the school. The true name of this shadow is the "Nishiki family". It is a growing conglomerate that secretly raises sex slaves and has established strong roots in the political and business world through profits and personal connections from selling whores.
The Nishiki family sent a thug to destroy the Higashizuma family. The name of this thug is Kuga Comet (Kuga Kay). Although he is still young, he was a skilled trainer who turned any woman into the best sex slave. Kuga Kay is one of many illegitimate children of his father. His father assigned him a mission of sexual enslavement of the prestigious Azuma family to train aristocratic whores.
At first Kay treated this request with ridicule, but upon closer examination of the goals set before him, he decided that it was still a worthy deed...
Since the school was originally exclusively female, the few male students admitted to it are unfairly discriminated against. Trapped under the tyranny of the Higashizuma family, the boys rise up to fight for their lives. All the boys' resentment falls on the Tozuma sisters; the boys pour out all their pent-up anger on the girls, alternately humiliating and raping Himari and Komari.
This allows Comet to trap the school principal, Shiyoku, and take full control of the school.
@Anitokyo