Note: This is based on a strangely Kingdom Hearts-ish dream a friend of mine had. Many of the characters in the dream paralleled ones from KH. (I'll leave a full list of the parallels at the end of the third/last chapter. If I've missed any or messed any up, please let me know so I can correct them.) So, with a bit of tweaking, I've turned the dream into a short story about what would happen if the darkness came to our world. (Disclaimer: I don't own KH. Duh.)
Southton Michigan was, under most circumstances, a pretty boring place to live. It was your typical Midwestern town: a remnant of the logging industry, built on the banks of a river. Hills surrounded it, and the tallest of these was Hyde Mountain. Southton was somewhat centrally located, meaning (although not very interesting) many people were always passing through.
It was also the home of a group of teenage friends. One was a beautiful girl named Erica. Her best friend was a brave girl named Amber, and they were both friends with the clever Leanna. Leanna's brother (and Amber's boyfriend) was a charming boy named Luke, and Luke was friends with the charismatic Chad and the very intelligent but secretive Eric. They were all rather different, but all adventurous.
Now, both Chad and Eric loved Erica, but Erica only loved Chad. After a long and complicated emotional battle (which sounds very much like a soap opera and would be very boring to read about) Erica rejected Eric. So a very desperate Eric gave in to the darkness to trick Erica into believing Chad to be evil. Chad, unaware of Eric's power, grew angry with her for her foolishness. He got fed up and decided that he didn't want anything more to do with her or Eric.
The burst of hate from Chad's heart and the breaking of Erica's made the curse complete. Eric became endowed with all the powers of darkness. Black-cloaked figures appeared everywhere in the city, dragging people to the formerly abandoned mansion on Hyde Mountain, which had become Eric's fortress. A translucent black energy field appeared around the entire city. No one could come in, and no one could leave.