I didn't, actually, I was talking about Aria and Aqua. In a future where Mars has been colonized, and the ice caps melted, Neo-Venezia hires young girls to be gondoliers in Mars' many canals. It's cute, it's slice of life, and it's set in something that is, IMO, a nice view of the future. However, because it does take place in a future Venice-like setting, the amount of actual sci-fi elements are slim.