Why Can a Hairy Boy Transform into a Magical Girl?

As a time traveler, Xianghe came to a world similar to that of Blue Star. However, his parents died early, leaving him and his sister to depend on each other. In order not to work two jobs during school hours, he decided to live a soft life, oh no, to marry into a wealthy family. But why didn't anyone tell him why a giant thunder pig monster burst out of the modern urban world, and why boys turned into magical girls? Forget about transforming into a magical girl, why would it be of different colors and colors? No pervert would capture me and go back to lay eggs. The introduction is incapable of being viewed objectively by oneself.