In the fall of 1991, a burgeoning anime fan named Benjamin D. Hutchins (who had chosen the login name "Gryphon" for the campus computer network) was attending Worcester Polytechnic Institute in Worcester, Massachusetts. He had recently fallen in love with a series called Dirty Pair, and had seen the first anime fanfics to be posted on the Net written about it by Ryan Mathews and Larry Mann. Gryphon decided to write a Dirty Pair fanfic as well, and in an effort to demonstrate the possibilities to his friends, he churned out something he initially considered a quick-and-dirty "proof of concept" story in which he brought Kei and Yuri to WPI with a plot device from a friend's story and generally let chaos ensue. Then he wrote some more, and some other writers expanded the setting.
Almost a quarter-century after the first story was posted, new stories are still being written in its universe. It is almost certainly the greatest Mega Crossover in all of Fan Fiction, and possibly in all fiction, period. The result is an epic, sprawling Space Opera setting that stretches across several thousand years of history and ranges across (and out of) the entire galaxy, written with a sly sense of humor and an almost religious regard for the Rule of Cool.