Well... I liked the ending... if not for the itching feeling on whether Hikari did came back... If there's a scene in the final that showed part of Hikari returning to Earth I'll be happy... (But even happier if she appeared out of my monitor and sleep with me). Anyway the ending reminded me of Final Fantasy X.
Overall my opinion is that the truth was revealed too quickly. I think the anime might have been better if there were fewer fanservice, and the story is developed more slowly. Episodes 9 onwards are great, made me excited for the next episode each time I've finished watching one.
Probably you guys felt that the ending was bad because you wanted the ending to happen in another way.
Hikari and Akari are cute
I hope they keep them coming, might not be in the form of another anime series, but just keep them coming
I wonder what the butterfly with abnormal wings represent... Hikari and Akari as a single being in the form of a butterfly ('Cause they lost their human bodies)?