Good story but lots of missed opportunities. There was more of a story in the intro and outro then show.
Honestly was disheartening to watch as you expected the show to revolve around a mysterious girl who would investigate a secret cathulu/Lovecraftian fish civilization but instead found out that plot was completely irrelevant.
The ending felt forced, like the original writer died after the second episode. Felt like the team behind the intro had more vision then the shows writer.