Dragon Raja: Primordial Ancestral Dragon

Ling Yuan, the universe's one and only Primordial Ancestral Dragon, had lived so long that boredom finally got the better of him. He decided to take the form of a young man and sneak into Cassell College for a vacation.

And so he became Lu Mingfei's roommate, an S-ranked "lazy mutt" who spent his days slacking off and loved making sarcastic remarks. While everyone else bitterly hunted dragons, he wondered whether the cafeteria was serving extra chicken legs that day. While Dragon Kings laid waste to the world, he worried about finding jobs for the "problem child" Dragon Kings at home.

He had planned to quietly observe, but his roommate was such a good-for-nothing, and the Dragon Kings around him were always throwing tantrums. Only when the shadow of the Black Dragon loomed over the world did Ling Yuan lazily raise his eyelids.

"All right. It's time to show you what the true ultimate rule is."

(P.S. The plot has been changed slightly, but there are no bizarre gags. If you spot anything wrong, please let me know and I'll fix it.)