Fast Travel: the World Is Collapsing

Due to the increasing number of collapsing worlds and the lack of staff in the underworld, there just happen to be enough people queuing up to be reincarnated in the underworld. Instead of queuing up here, it is better to help the underworld do things. After his death, Moezuka was selected into the underworld's fast-traveling department. Through the technical department, he was sent to the world that continued to collapse to solve the problems of the world and prevent the world from continuing to collapse. As he came and went again and again, Moezuka discovered that things were not as simple as imagined. Why are there more and more collapsing worlds? Can the underworld traveler really accumulate energy and be reborn in a good pregnancy? Things are getting more and more complicated (the heroine works slowly but steadily, does not pursue quick completion, has a strong sense of responsibility, and is calm at heart)