First play: ending 7 of 9. Nothing explained. Dang.
Intrigued with the music and the special effects. Very professional look, both in art and in presentation. Top-notch game, that one!
Now looking at the spoilers to find out more
Final comment on ending 7: It's a little frustrating that essentially everything ends on a "game over" without knowing why. In the future, you live with a woman, and you reflect upon events in the past, and you are about to start a relationship with someone else, and then the game ends. Could have been done better, I suppose, or a little more satisfyingly at least.
More when I finish the other endings.
*edit*
Got a few more endings by now, including the "only Ochi" ending and, of course, easy Onoe. (And Ending 9 which, I believe, is a little joke on the makers' side.) Still missing the elusive ending 4, mostly because I am not willing to randomly try out different foods and ways of making love until I found the right combination for the lock.
What Malevolent Benefactor wrote about the arbitrariness of choices is, unfortunately, correct. OOO constantly reminds me of the "sweep the floor/mop the floor" choices in "Tokimeki Check-In" where simple everyday things make the difference between Best Ending and Bad Ending. Later in the game, most choices make perfect sense, but the fact that you can really understand the system later and still fail the ending you want to because of a minor choice made half an hour before just makes it too frustrating to make me play this again. I'd still like to comment on the entire plot, so if someone would be so kind to provide a walkthough, I'd be very happy.
*edit2*
Me the fool. Just found that being in part II is enough for the rest of the endings and the "food choices" are no longer relevant. I'm taking back what I said - it's not like Tokimeki Check-In, it's more like Snow Drop. Do one decision wrong and you don't get to the part where the game becomes really interesting ^_^
*edit3*
Now I finally got all the endings, except for 8, and to be frank, I have no idea how to get to that one. The hints so far seem to indicate that you needn't enter part II for it, however, all I can find "hidden" before that is ending 9. Any hints?
Aside from that, an intriguing story.
The twist in the story is that the main protagonist isn't telling the player what's wrong with Ochi/Ori until you reach ending 4, the True Ending. This makes the game a little less immersive than GR where you, to be frank, shared every little emotion with the protagonist and there wasn't single thought hidden from you. Makes for good drama, I suppose, but unfortunately also for some very strange endings, like 7 when everything before that seemed just fine. Of course, knowing ending 4, it still makes sense and all, but in my opinion, VNs shouldn't be like that and at least offer a partial explanation in every ending. I mean, if the game ended on "game over" right after the final decision leading to 7, it wouldn't be less satisfying, at least not much.
mikey seems to like stories about people with strange conditions, eh? The trapped spirit in River Trap, the writer with dyslexia in K*A*O*R*I, the manic-depressive protagonist of GR and now a split personality - medical conditions make up for great drama, don't they? ^_^
And now again: any hints on ending 8? Please?