Main Character Syndrome System

Imagine you suddenly reincarnated into your very own novel after you die. You would expect it be all sunshine and rainbows, me being the author and all. Unforunately, my novel was set on hell difficulty, matter of fact, higher than hell difficulty. A world where demons run rampant, humanity is barely holding on, and internal strife runs strong. This is the type of novel I wrote. The tragedy of a hero who lost it all trying to protect what he cherished. Maybe that's the punishment of having a harem though. But now that I'm here, I'll make sure everything changes. Before that though, what is this main character syndrome system doing infront of me. ------