• This is a third-party fan work based on the Dungeon Hospital AU by Raonmir (@Raonmir_Tuned). I took most of character designs from the original AU, but the settings and story were newly created by me. Some elements differ from the original AU.
• Any feedbacks and suggestions are welcomed!
• Dungeon Hospital AU: https://twitter.com/Raonmir_Tuned/status/1386680838134194177

The island known as Middlesea was once bustling with adventurers. There was a famous dungeon in the sea where the island was located, and this island was the only one along the sea route to that dungeon. For adventurers, the island was the perfect place to use as a base or to rest while exploring the dungeon. Sailors passing nearby also usually restocked supplies or repaired ships at this island. Adventurers would often trade treasures brought out from the dungeon here, and thanks to that, the island's residents lived comfortable lives.

However, the dungeon that had seemed like a Widow’s cruse began to show its limits one day. New zones, filled with monsters and treasure, was eventually no longer found after the interval between discoveries became longer and longer.

Soon, every nook and cranny of the dungeon was fully explored and mapped, all the gold and treasures were taken out, and even monsters began to die out, and visitors to the island dwindled sharply. The wealth, population, and glory built on the dungeon's riches faded quickly, and the village reverted to what it was before the dungeon was discovered: a small, unremarkable fishing village. No adventurers remained on the island, except two retired swordsmen who had come from the far East and settled here.

The residents of Middlesea now lived quiet, peaceful lives, but plainer and somewhat more monotonous than before, unaware that a destiny was coming that would turn the entire island completely upside down…