I believe it's K1 because K="kei" and 1="ichi", hence K1="Keiichi."
Hmm... powerful episode, though I wish it could have been longer so that we could get a little bit more information from it. Needless to say, I'm utterly confused at the moment, and shall refrain from coming up with any theories of my own until I watch it again (even though, after watching the next arc, all theories I do come up with would possibly be void...)
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