Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 17 - 17-27. Authorities on Loan

This is the story of how I became an outer god.

The strongest Demon Lord dies, and reincarnates as a human. Not only that, he because of various incidents turns into the hero’s best friend.

Follow his journey as he tries to help the hero escape his fate, and on the sideline to conquer the continent while he’s at it.

Han Yun was spoiled from childhood.

He survived past his emperor dad and crown prince elder brother, and became an emperor.

He didn’t know how to govern the country, but he was lucky—there was a Grand Preceptor who “assisted” him, spoiling him even more than his father did.

After just a few years, this puppet emperor died. When he awakened, he had transmigrated into the modern world, becoming a third-rate model struggling alone without any loving parents.

Just when he thought he had become a little cabbage that nobody wanted and no one would ever spoil him again, a certain ancient monster of a Grand Preceptor who had lived 1,000 years appeared again… and looked to be doing quite well for himself.

The utterly impoverished little emperor had tears in his eyes: “Beloved subject! Zhen (royal We) have missed you so much!”

Grand Preceptor: “Your Majesty, this minister has waited for you for a thousand years.”

- Description from Novelupdates

Zombies, cold waves, floods, earthquakes, acid rain, tsunamis, extreme cold, high temperatures, land pollution, seven days of darkness... Since the year 2563, humanity had endured such apocalyptic crises for a full ten years.In those ten years, plants mutated, animals mutated, the food that once fed humans became toxic, and the lands that could once grow plants were now polluted. The living space for humans was increasingly compressed.And at this critical moment, a five-story supermarket suddenly appeared.Here, one could buy piping hot oden, tasty instant noodles, and sweet White Rabbit Creamy Candies...Countless Superpower Users greedily wanted to take the supermarket for themselves.And then...They were all kicked flying by Su Yinhe with one kick.Su Yinhe spread her hands, “I didn't bring the Infinite Supermarket here to be robbed; I came to make money.”A Superpower User who felt like he struck gold after buying a box of instant noodles: “Miss Su is beautiful and kind-hearted, to only charge me ten gold bars for such a huge box of instant noodles.”A female Superpower User who hadn't tasted sugar in ten years, with tears streaming down as she savored the candy: “Such sweet sugar, and it only costs one gold bar. Miss Su truly is a great person.”A Superpower User who ate the supermarket's oden and then didn't want to leave: “I'm twenty-five this year, 188, Gold Element superpower...”Su Yinhe, only wanting to make money while holding a pile of gold bars: “Keep it low-key, low-key.”