Chapter 1: The Advent I must find one… a pure, untainted body… before Walpurgis Night… Walpurgis Night. In the basement of an academy, amidst the sound of eerie incantations, a ritual is being performed upon a beautiful, completely naked girl—a sacrificial offering. Twelve years later, Taki Minase discovers a "grimoire" in that same basement. Using the secret spells contained within, he succeeds in ensnaring his crush—the student council president, Rika Shiraki—turning her into a slave to her own sexual desires. Meanwhile, a series of lewd incidents begins to unfold throughout the academy. What is this "Walpurgis Night" that now threatens the beautiful girls of the school once again? The sixth, highly anticipated release from Milky Label—a daring, explicit adaptation of a smash-hit PC game that sent shockwaves through the industry—is finally here!