Let me be honest, I buy most things by Reiko Shimizu based solely on their looks. All of Shimizu's work is beautiful -- clean lines, well-proportioned drawings and beautiful details. But she also has incredibly wonderful stories, so don't worry if I ignore the story and only mutter about the artwork -- the stories are great.

In any case, Tsuki No Ko is something like an updated version of the fairy tale "The Little Mermaid". Essentially, it goes like this. The mermaids are a race of beings who come from the moon. To have children, they have to go to the earth; but once, one mermaid fell in love with a human instead of mating with the mermaid she was supposed to. Afterwards, there was a prophecy that if that should ever happen again, the mermaids would be ruined. And so one day, they send off the next mermaid to earth, named Benjamin. A note on mermaids before I continue. They are supposed to be the images of little boys when they are immature, but when they mature, they become beautiful women. Anyway, so Benjamin is in a car accident, and loses his memory. He then lives with a young dancer named Art and Art dubs Benjamin Jimmy. Afterwards, Jimmy begins to mature in odd ways; she becomes an adult woman all of a sudden, and confuses those around her, and then returns back to Jimmy, the boy. Naturally, she is deeply in love with Art, but Art doesn't recognize her as an adult -- literally and figuratively. The story kind of continues on that thread.

It's fairly slow moving, but I'd say that the beautiful art work makes up for all that. But maybe that's just me.