It's clearly not a masterpiece far from it but if anyone of you feels a lack mermaid content well it's that kind of average moe slice of life anime where literaly nothing happens besides village band of girls eating sweets, seeing movies and being friends but the submarine mermaids version of it. It's ok to chill when bored just sayin' in case someone want that kind of content or kinda collection every stuff with mermaids in it. The 12 episodes were a bit tedious but relaxing to me at least. I found the marine pet cute.