Is It Abnormal for Me, a Nanny, to Kill the Devil Instantly?

Chu Mao worked overtime on New Year's Eve and fell down from exhaustion. He traveled to another world, but he never traveled to a female wet nurse. The system compensated for the ability to break through the limiter... Then Chu Mao began his journey to the other world, killing the Demon King with one punch and beating the Demon God with one hand. Just one look can make the gods tremble. Why? Is this nanny so ridiculously strong?