Fish people have been welcomed to the town where the human girl Wakasa Otomi lives, and they are integrating well. The fish people can be identified by the physical marks of their fish species, though they take medicine to keep their lower bodies human rather than a fish tail. Otomi loves fish people, and is eager to meet as many as she can! One day, she meets a new transfer student, a lantern fish girl named Tsutsumi Anko. Anko is a bit self-conscious about being a deep sea fish, with a tail that is not cute like some other fish girls. At school, she and Anko deal with various fish problems that intersect with issues an ordinary human high-schooler would face.
In the era of anime/manga where people are going rampant with anthropomorphism, it's not surprise that they would do it with fish; something though that does set this manga somewhat apart is the fact that the humanized fish are technically mermaids, just with different ocean-life species. And I gotta admit, the idea of having a manga centered around mermaids that actually include different species of fish is a pretty interesting one.
The characters are decent at first glance, but the meat of most of them is how the author places characteristics of the fish into their personalities. Anko's bulb lights up when she's angry
or scared (the bulb fittingly drawing other fish towards her), the eel character has slimy skin, the pufferfish can bloat up and expel poison, it is really fun to see what sort of things each fish will do in their human-esque bodies. One of the characters in particular leads to a strangely funny (though horribly awkward for Anko) situation where, being a pearlfish, she feels the need to stuff herself into dark, small places.
The only human character presented prominently through the manga is a girl who has a thing for mermaids. She plays the typical role of genki girl and tends to be a bit generic because of this, but still tends to be enjoyable through most of the manga.
The art is typical of a slice of life, with soft, rounded lines and equally soft colours. A few times here and there the faces are a bit off model, though not enough to totally distract from reading. Fitting for the subject matter, the tails for each mermaid are more detailed than the manga really deserve.
Although the story is essentially your very typical 'cute girls do cute things'/'monster girls living amongst people' shtick, it differs in a couple ways: the facts it teaches about fish are actually pretty damn interesting (some of them I was unaware of) and it's fairly light-hearted with minimal fanservice, giving those who are tired of the stream of erotic monster girl manga a breath of fresh air; both things that made up for part of me continuing to read it.
So if you're looking for an oddly factual monster girl series with cute characters, cute scenarios, and without the intense eechi factor, this could definitely be up your alley.