How coincidental! I just played through this game and thought about posting what I got out of it here and immediately found this thread. :-) I'm not going to bother now since Swizzle just uploaded a playthrough. Highly appreciated BTW! :-) I hardly understood any of the dialogue myself.
I also went with Rei-chan! Don't know if you can get different ending screens with the same character...
I understand pretty much all the dialogue and actually played through with Venus the first time I played it and I think Venus had a much more interesting story for the first half before
it becomes exactly the same. People wanted the recorded playthrough to be with Rei so that's why I did that.
If I wasn't so lazy I'd put subtitles so everyone could understand what's going on, but even when you do understand it's so ridiculous and so disjointed that it's probably better off
not knowing. Maybe it makes more sense if I play with Usagi, but I haven't played it with her yet. The beginning and end are pretty funny though and full of jokes.
Usagi and Naru's conversation at the end is brilliant.