So
Ore-Tachi Ni Tsubasa wa Nai recently finished, I have a feeling that no one else bothered watching it but with the last episode the plot finally makes a whole lot of sense.
WARNING SPOILERS
There's three main characters; Takashi Hanada, a high-school student who seems to have a somewhat weak constituion. Shuusuke Chitose, works as a book reviewer and recently started working at a bar. Hayato Narita, seems to be a handy-man of sorts as well as being quite outwardly rude and awkward but obviously has a good heart.
At the end of the first episode Takashi admits to being an alien (albeit to himself) and later around episode 5 it becomes apparent that these three share the same body with Takashi having it during the day, Shuusuke during the late afternoon and Hayato during the evening. To us, the viewers, the all have their own separate appearance but in the story there's no physical change when one person takes over the body so they're all perceived the same. There's also two more people hiding inside that body, one of which (Karura Itami) is also the narrator and surfaces once when things get very violent and takes over for about a day. The other is only briefly mentioned until the end (Youji Hanada). It's also apparent that everyone but Takashi knows about everyone else, it seems that whenever Takashi has trouble due to his weak constitution he escapes to his fantasy world that he believes he's a part of, hence he thinks he's an alien. This fantasy world is exactly that, it's a world he made up from playing an old SNES game.
Blar blar blar they all have own "events" so-to-speak and we finally come to the last couple of episodes. Takashi has an episode and escapes to his fantasy world right in front of his girlfriend (Asuka Watarai), Shuusuke has to pick up the pieces but Asuka's not buying it and immediately asks who he is and where her boyfriend is. Shuusuke explains at least some of it to her and tells her not to tell Takashi, however later she does confront him about and Takashi has another episode. Last episode Takashi is finally aware that his fantasy world doesn't exist and has a chat with Shuusuke and Hayato.
So here's the big plot "twist" and some of this is my interpretation since they never really specify exactly what's going on but it makes more sense than "aliens"
None of these people actually exist other than the one that's barely been mentioned, Youji Hanada. When he was young he went through a very traumatic event with his mother going nuts on him and his sister (Kobato) and since then he locked himself away in "the abyss", which I guess is basically his psyche. He created another personality, Takashi, but he was mentally flawed and thus Shuusuke and Hayato had to be created for more "stability". Karura was probably a product of his anger manifested. So there you have it, Youji has Dissociative Identity Dissorder, he comes to terms with the past and finally surfaces to take control of his life again. Now he looks just like Takashi but has a different voice (to represent his original character I suppose), he has to wrap up all the loose ends that his other personalities had and that's the end.
Very interesting plot for what was originally an H-game. Though I found out that Kaboto is one of the girls you could pursue in the game, she's his sister, that's kinda nuts...