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I just decided to watch this pretty much blind since I have no idea what the hell this is about. If I did know at some point, I must have forgotten.
Anyway, episode 1, "Invasion of the Capital". We're introduced to the protagonist, Ayato Kamina. He meets up with his friends to take the train somewhere. We'll probably never find out where exactly, since the train gets stopped suddenly, and woah, outside has suddenly become a warzone.
(oh come on, I can't be the only one who thought of this!)
It's not yet clear what the hell is going on, but apparently the JSDF are fighting something called "Invaders". I can almost hear Hideo Ishikawa.
Kamina gets separated from his annoying friends, whom remind me of the protag's friends in Linebarrels of Iron for some reason I'm not sure. Is there gonna be a love triangle with them? He meets up with Reika Mishima, whom he apparently knows. But so far, she mostly juststands around lookin mysterious, so all I can tell is she's important.
There's a scene where Kamina is bothered by some mysterious-looking "federal agents" and some Orange Headband Lady saves him. He runs away because, well, why wouldn't he? Orange Headband Lady is kind of terrible at acting trustworthy. It's all very unclear what's going on, but he gets on another train headed for "Xephon Shrine". I'm assuming this is where the eponymous giant robot appears, based on the next episode preview. Reika seems to have something to do with the giant robot. And the episode ends here.
Next episode: God and Man Awaken. Is this metaphorical like Mazinger Z, or is RahXephon a literal god in this universe? Don't answer that, or at least keep it in spoilers.