Demon Slayer: Run! He's Mentally Ill, and So Is His System

[Slaying demons + comedy + invincible protagonist + mental illness + wish-fulfillment]

Chen Ye is a mental patient. He’s been an alien, an assassin, a doctor…

Now, because of his cognitive disorder, he thinks he’s in a video game!

The officers and demon slayers fighting monsters are players just like him!

Ordinary people are NPCs who give out quests!

With the help of an equally abnormal System, he, Codename 007, is determined to become a top-tier player!

He’ll become the king of the game!

And so the world gained a demon slayer with a mental illness: Codename 007!