Men wear women.
CP is unknown, fake and beautiful.
The protagonist travels to a Mary Sue novel, and she is also the heroine.
It is said that this is a task given to him by God, and its ultimate purpose is to save brain-dead patients.
... By the way, why God? Isn't this an ancient romance? Is it really okay to join Western fantasy or something? !
In short, let's see how the miserable protagonist withstands the pressure and desperately saves Mary Sue in this desperate world.