The Babysitter Wants to Stop Dying

I was possessed by an extra in ‘The Demon King of Astava’, a game pack I borrowed from a friend before I died. There is only one quest. <Find the Protagonist and Save the World!> Failure results in the world's destruction. But all I was given was a crappy ability and a massive loan. Quest or whatever, I have to live first. I'm paying off my debt as a babysitter at a childcare center I barely got into, but.... The baby I'm in charge of, ‘Lottie’, is no ordinary child!?