The Demon King and I Turned the Demon Realm into a Game

Fourth Calamity Style

A typical protagonist would have a desolate territory,

come across an unknown System,

and have the System turn another world into a game.

But sorry, Lu Lang is an atypical protagonist.

He is the Demon King’s System,

and he has to help the Demon King turn the Demon Realm into a game...!

Lu Lang: Those underground demon spiders can't all be killed! We need to leave some for the players to fight!

Theme: You have to keep striving to live a better life.