Matoko starts to live with his aunt, because of his parents' frequent transferrals for work. It turns out that Matoko has a cousin named Erio -- a weird girl who wraps herself in a futon and lies around the house. His aunt completely ignores her and avoids Matoko's questions about her. It turns out that Erio dissapeared for a while and was found floating in the ocean, without any memory of what had happened. She constructed a narrative for herself that she was an alien sent to watch this town -- hence not having any recollection of what happened.
Matoko takes pity on her and, through a rather forceful experiment, he convinces her that she is a human and not an alien at all. Erio tries to take up a normal life by taking up a job at a general store to help granny (I'm guessing Makoto and Erio's great-grandmother) who is obsessed with aliens as well. This time it's Matoko's aunt who arranges a display of fireworks to chase off the aliens.
And then there's Makoto's inability to give something his full effort -- which he overcomes with the help of his sort-of girlfriend.
It's made by SHAFT, and it does have a lot of SHAFT-isms. Some people won't like the series because of it (and it's starting to irritate me too), but if you look beyond the usual otaku-bait, there's actually quite a bit of plot and theme packed into this show -- you just have to want to look for it.
Visually, the series is quite polished -- as we have come to expect of SHAFT. I really liked the opening and ending songs too!
- Polished, starts of weird;
- Underlying themes.
- Lots of SHAFTisms.
All in all, I enjoyed watching it -- but it isn't by any means essential. A 7.