Our story takes place in a world different from our own. Flora is a schoolgirl attending an all-girls school in the city. One day, she is suddenly assaulted by a monster, and saved at the last moment by an otherworldly heroine named Liese. Why was she attacked? What was that…

Upon losing to the hero, this demon girl swore an oath of revenge… by erotic level drain!? Not only will the hero lose their levels but also their freedom!