Quick & Dirty:
Comical, creative, and clever. Likable, especially if you like mermaids. It's pretty short, and is worth a try.
[Ed: Oh- I guess I should mention one of the mermaids is an oppai-having masochist, so a few episodes are particularly... Um... yeah- use your imagination... Anyway, if you like that sort of thing, there ya go.]
Detailed Review:
Essentially a modern day mythological reboot of mostly nautical monsters as personable characters, this creative anime is a comical look at the 'real' monsters of old, some retelling of their history, and how they relate to an ordinary human. Hijinks ensue.
Story: 7
Although the meat of the story is nothing spectacular (it's slice-of-life), between the creativity and humor I give it a higher rating than I normally would.
Art: 6
The art and animation are good, focusing on a simpler style, but being slightly inconsistent within that style. It does a good job for what it is, though.
Sound: 7
The voice acting is quite good, and the effects and music are good as well. No ambient sounds in most scenes even though they're usually outside.
Character: 7
Though the types of characters chosen is pretty boilerplate- the interactions and dynamics of each are used more creatively than most, and even the stereotypical types are given quite a bit of personality beyond each cliche.
Enjoyment: 7
I like it a lot more than I thought I would.
Overall: 7
As a mythological 'reboot' with a lot of clever innovation, it's pretty good.