姉妹遊壊

• Story
  Emily Hayama and her close little sister Anne returned to Japan
  after several years living abroad in France. They were admitted to a prestigious private school.

However, their homecoming was marred by the atrocious son of the school's top chairman, Yuujou Takashina (protagonist) who was the president of the student council.

As future owner of the school he was completely uninhibited, abusing power to dictate the terms of the final exam.

His target, the Hayama sisters.
Their despair began--

• Sisters cornered in a game of despair
  Emily put herself into the game to save the Hayama family, and little Anne entered to save Emily.
  Two beautiful sisters are unforgivingly seared by the brand of men's lust, facing utter hopelessness, and betrayal---

[From DLsite English]