I'm in Gx, What's Wrong with Using My Sister Card?

Before traveling to the Yu-Gi-Oh GX plot, You Yang accidentally turned into a child because of the power of elves. But because of this, he gradually gained the favor of many elf girls? Half-Dragon Maid, Witchcraft, Sea Crystal Girl, Sky Striker, Trickster... From then on, You Yang embarked on a path of no return for playing girl cards. Many years later, You Yang, who had traveled all the way, stood at the top of the royal road and sighed. "Sorry, Play girl, you can really do whatever you want." ... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.