Fantasy: The Do-Whatever-You-Want System

Protagonist: What the hell are you?

System: I'm your Do Whatever You Want System!

Protagonist: Do whatever I want?

System: That's right. Do whatever you feel like!

Protagonist: Holy crap, I can do anything I want?

System: Don't flatter yourself. I'm the one who can do whatever I want!

Protagonist: ...

After the protagonist gets the Do Whatever You Want System, a string of laughable missions gradually makes him invincible across the myriad heavens, reigning supreme over the world!

This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.