Rain: The Eternal Deluge

No System, no mutations, no special powers, no technology.

The apocalypse has arrived, and the cause is... unending rain.

No zombies, no aliens, just soaked clothes and underwear that never dries.

The protagonist, Lu Yuan, used to be an architect and is now the CEO of an apocalypse survival team. His job is to use professional knowledge and practical methods to keep his teammates alive and make their enemies wish they weren't.

His team is a motley crew: a retired medical director, an IT director still in school, a logistics manager who moonlights as a babysitter... They're the scrappiest outfit in the business.

They thought surviving the apocalypse meant fighting monsters, scavenging supplies, and building a base.

Then they discovered the scariest thing wasn't the disaster, but the leader of the Ark Society, who had predicted it all and believed that “humanity needed to be purified.”

He was none other than the one online forum troll Lu Yuan had never gotten along with, the only person who could argue with him for three hundred posts on the architecture forum back in the day.

When the enemy who knows you best brings about the apocalypse, the fight for survival suddenly becomes the grand finale of a years-long online flame war, with the fate of all humanity at stake.

The blurb doesn't do it justice. Read the story itself.