 If you liked
X
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 ...then you might like
K
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Two fighting factions, which members have supernatural powers. Many bishounens. Apocalyptic theme. Megapolis backgrounds. And very strange one letter titles, which make hard to find these animes on torrent trackers!
Both anime revolve around two gangs of magic users, who are fighting each other. Both anime have a bit of shounen-ai. Both anime have a single letter in their names.