This Might Be a Fake Gintama

Jiang Cheng was born from the leyline of a certain planet, Altana. The first people he met were the Hoshikai Boushuu, traveling through the universe, and his girlfriend, Jiang Hua. Through a strange twist of fate, he later ended up on Earth, where he met Yoshida Shouyou, the teacher who would shape his life. He also met a group of friends. The most conspicuous among them were a fool with silver hair and a natural perm, a short fellow with purple hair, and a kid whose catchphrase was, “It's not a wig, it's Katsura!” A Gintama fanfic, not a transmigration story.