The Ghost King's Awakened Bride

I snuck into the human world for romance, only to be sacrificed to a Vengeful Spirit by my boyfriend! He didn't know I'm the red-clothed demoness of this Instance, and the Ghost King is my superior! The coffin opened, I shed my human disguise, slaughtered everyone! The scumbag and schemer are doomed, players become my nourishment, the game company is an Instance! An awakened NPC strikes back, and my Ghost King husband and I will rule the three realms!