Utsukushiki Emono-tachi no Gakuen (Sin Sorority)

Synopsis

Asuna Sugihara prepares for her first day at Saint Rei Seine, a prestigious academy attended by the upper crust of society. Overwhelmed by the new atmosphere, she accidentally runs headfirst into Yurika Ichinomiya, the student council president known as the Queen of Saint Rei Seine. Little does Asuna know that Yurika also leads a secret group in the school's basement—where the members satisfy their darkest sexual fantasies—and she has chosen Asuna as their next initiate. [Written by MAL Rewrite]