Yuuki Rito is an average high-school student: awkward, shy, and hopeless when it comes to confessing his feelings to the girl of his dreams. But one day, a beautiful woman suddenly materializes in his bathtub--an alien princess on the run from an intergalactic empire. After Rito gets unwittingly engaged to Lala, he soon finds himself sucked into a battle for her affections.ions.
In a world of swords and sorcery, Lord Arc--heir to the modest land of Nagara--is a gentle soul thrown around by political forces. After watching Aurelia, his long-time love, end up promised to a more powerful man, Arc curses his weakness--until a seductive Dark Elf appears, promising him strength beyond his wildest dreams. She tells Arc that he has a mysterious force deep inside him, and with training and a course of arcane sexual rituals, he can unlock it to become a man of immeasurable power. Little does Arc know that world-threatening doom is coming to the land, and his new magical force will draw countless beautiful warrior women to his side, hungry to join him on the battlefield...and in his bed.