[Brain + Game + Different World + Cthulhu + Super Power]
The male protagonist's sister was mysteriously abducted by a group of weirdos at an amusement park.
In order to embark on the road to find a girl, I walked into a crazy mental hospital and accidentally discovered that behind another wall of the hospital, there was a strange world. The humans in it had all kinds of evil powers, including man-eating ghosts, beautiful elves, powerful gods, and mysterious demons.
How can a mortal rescue his sister?
The only unchanging law in the world is the strongest.
Possessing power comparable to that of gods is the way to break out of the shell!
