An ordinary person [Kurumi] who was suddenly transported to another world and became a lewd demon. In a world where humans and monsters are at odds, the monster side is unexpected. What's more, her essential magical power is completely depleted, abandoned by her friends. While she was living a miserable life in another world while running away from humans hunting monsters, the first person who reached out to her was a sorcerer. (This is the only way for me to survive!) "M-Please make me your familiar...!!" (I don't care how miserable you are! 　If you're by this gentle magician's side, 　this world will surely be yours!) (You can survive!) Kurumi seemed to have found peace by making a familiar contract with the magician Lamour, but ... ``Even though you're a lewd demon, you can't give up your roots with such stimulation... You're such a small fry.'' He's completely changed from that gentle magician. Lamour was a sadistic magician who had no mercy for his familiar...! He uses every means possible to supply magical power for Kurumi, who is a lascivious demon. Kurumi, unable to resist her demonic instincts, drowns in pleasure. Will Kurumi be able to safely return to her original world?...!?