The ending made sense, but I never really felt Hana and vivi effectively moved from child and guardian to lovers, so the whole thing was a little creepy... They didn't even go on "dates" or do anything particularly romantic.
Optimistically, the series ended too fast, but... Hana never showed any maturation over the series. Even after the 3 year jump, and subsequent 1 year jump, she still acted like an eight year old.
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