Yokoyama Kamiko is just a seventeen year old NEET, living her life in a self-destructive way and letting herself go deeper into a cycle of self-hate. 
One day, after a terrible incident, she meets God. She is then given an ultimatum: be transported into her favorite RPG 'Chronologia: Alter Salvation' and defeat the big bad boss of the game for the chance to be returned back to Earth, or be forever damned. 
After finding herself stuck as a baby, she knew that to survive and get back home she would have to clear the game. By any means necessary.