Trash Hero

Karen Was a pretty garbage human, so it wasn't to much of a surprise to her that she also made a pretty garbage hero. But she never asked to be hauled to another world with a plethora of other subway patrons to fight monsters for a bunch of self important other worlders either. So, you get what you pay for in the end.
But this already tail spin of an adventure takes an even darker turn when Karen is left for dead in the depths of a dungeon, fighting to live just one more minute. In the depths of this hell hole she is presented with a choice: Die, or become the next Demon God.