Leon Ackerman is my name.

I use to read novels about villains and hero's, where villains were defeated by the main characters.

Villains were bad guys who were pure evil.

But sometimes just broke characters, who needed help.

One day, something new happened in my life.

I was reincarnated into a fantasy world, where I was chosen as a hero, who needed to defeat the Demon-king and many other villains of that fantasy world.

What would you expect...

I, the hero who was consider a SSS rank hero to kill the demon king.

I did...

But at what cost? I lost everything when I killed the demon king.

It wasn't the demon king, who had killed them.

Nor any other villain.

But rather the people, called kings and queens, holy blessers and holy heros.

In this world, the villains were just broken characters.

Who were called cursed monster there whole life.

And the real monsters, played the role of good guys.

In order to fix that. I Leon, With the help of the system.

Will fix everything and to do this, I must retire from being a hero and must start a new Life as a villain.

This is what I say an SSS hero or SSS rank hero retiring to start his own villain arc.