Sandrise City was a metropolis with a population of over 300 million, and every day, an enormous amount of waste products had to be processed in the city.

Hence, the city was split up into two levels, one on the surface, and one underground.

The sewage system responsible for processing the waste matter produced by over 300 million people was like a massive, convoluted ant kingdom, and there was no lack of strange occurrences taking place in there.

On this day, two people arrived in this sewage system.

"It's just up ahead, Boss."

A man who appeared to be around 40 years of age was wading through the putrid sewage, but he wasn't displaying much discomfort.

Trailing along behind him was a young man who appeared to only be in his twenties, and he was far less accustomed to this environment. It was clear that he was...