Digital Mystery Dungeon

Long ago within the digital world, a great being, beyond that of the average digimon rose within the world. It rampaged, cutting rifts into the server with it's abilities, cutting through entire dimensions. It's goal was unknown, but the corrupt data from those rifts in the digital world affected digimon from the exposure to such unnatural data, much like a modern virus. The Royal Knights banded together to take down this great being who caused havoc by the order of Yggdrasil, and succeeded. Or, so they thought. Rifts still remained over the digital world, and it seemed like remnants of that digimon's data still lingered, but even with the help of the royal knights, there were too many rifts to handle.

In the current day of the digital world, these rifts (now called dungeons) are still prominent, and even seen to be growing. The royal knights hardly appear anymore, leaving it to the common digimon's hands. Digimon raid dungeons, finding them abundant with digizoids, and some groups even erupt solely to take down the dungeons.

One day, a famed raider finds a rookie digimon with a mysterious symbol on it's body, claming to be human. Could this be interference from Yggdrasil? A human finally sent to save the world?