you are a university student named Reiya Shiotado. One day, Olga Discordia, the queen of the Dark Elves from your favorite erotic anime Kuroinu, suddenly came to life and manifested herself right in front of you. After helping her come to terms with her new surroundings, you find yourself befriending and taking in the hot Dark Elf queen from another world as your roommate points at you with a game controller Young human servant Reiya! I challenge you to a duel of Mario Kart! Do you accept?!