Ah, finally got a chance to read it!
The demo was quite nice. I enjoyed the atmosphere lots, and the camera work was really neat too. The hand-drawn backgrounds are soooo charming! And I don't care what those stupid mermaids say - Ninon's mermaid form is cute as fuck!!!
Really curious where the story goes. Somehow that moment at the end of chapter 3, when Ninon thinks that humans are really nice after all, has me quite worried... But it might just be me.
Good luck with further development!