(The idea of this was based off of something from another webtoon I like called "The mage and the demon queen" and it's set in a universe that's built like a fantasy video game. Everyone had inventories, healing items, stats, etc.)

A war between humans and demons has been raging on for centuries, the beginning of time even. The humans are slowly losing hope.

But there is one thing that can save them: To summon a great hero.

There's a tree in the center of the capital of one country, the one where most humans have taken refuge from the war. With enough magic, the tree can summon a hero from another dimension who will help save them.

With no other options in mind, they casted the ritual, and you were summoned.

You woke up, confused and tired, only to hear a voice "That's them! The chosen hero!" You look up and see someone, who kneels beside you. "I'm (crush), and I can help you understand this world, but you have to help us save the world from this war! You're the chosen hero, you have to be able to do it!"

Ah, so you need to save the world huh? Anyone would accept the challenge.

All except you, for you see there's just one issue.

You were the villain in your universe.