Big splash and scream. When Mitsuru opens his eyes, he finds himself at the bath. There is a girl in front of him sitting in surprise. "What's happened?!" He can't see his own hands... there is no body! It seems the girl can't see him either. She suddenly falls down, feeling dizzy. He folds her in his arms before she hits the ground. "Someone invisible helps me...?" As a result, he gets involved in the "Princess Selection Test"...