It leaves so many questions... yet i love the art feels like little mermaid. there was a moment i even question if he was a human who turned into a mermaid to save the guy thanks to the jewel... not the case but it could be interesting.
Kamigami no Namida is a seperate story that comes before this one, it explains the jewel and the whole selling mermaids thing. I think the first 2 color pages here are what happened after that "prequel"... So Nize was likely the friend from that other mermaid.
feels incomplete because it is- apparently there are more chapters-both before and after- i think, that are not scanlated here. the merpeople were very pretty, but since it was sort of presented without context, i just didn't have much to work with.