I'm a Sister-Obsessed Maniac, and I Signed In as a Supreme Being from the Start

As an overprotective big brother with Supreme-level cultivation, he flies into a rage when he finds out someone has hurt his younger sister. He'll make the culprit pay.

But before he can find the culprit, his own little sister starts insisting that he's not her brother!

What... is he supposed to do?

"My sister comes first. I'll take on the whole world for her, if I have to!"

That's my vow as an overprotective big brother.

This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Do not imitate.