Original Title:グリモワール～淫虐の魔道書に溺れる百合姉妹～
Description:
One day Asami witnessed a moment of lesbian kissing between the target of her yearning affections, Miyuki, and her dorm mate and friend, Kyoko.
Shocked and jealous, Asami felt her chest would burst, when a strange "voice" inside her own head spoke to her.
"Shall I grant your heart's desire?"
Asami followed the voice to the library, and before she knew it a book was in her hand. And the voice said,
"Relinquish your mind."
And she opened the Grimoire, and wished.