Rui was in school inside the science laboratory along with Tsukasa and his other classmates. Their teacher asked them to experiment with different liquids and substances to make a potion, and whoever performed their experiment in front and made the most interesting potion, would get the highest score. Rui had no problem with this at all since he was a smart person himself. The potion he had made was pretty interesting, and it's.. a liquid that could change anyone's gender to the opposite!!! Now he just needed a test subject for this to work...