Tsukimi Kurashita has a strange fascination with jellyfish. She's loved them from a young age and has carried that love with her to her new life in the big city of Tokyo. There, she resides in Amamizukan, a safe-haven for girl geeks who regularly gush over a range of things from trains to Japanese dolls. However, a chance meeting at a pet shop has Tsukimi crossing paths with one of the things that the residents of Amamizukan have been desperately trying to avoid a beautiful and fashionable woman! But there's much more to this woman than her trendy clothes! This odd encounter is only the beginning of a new and unexpected path for Tsukimi and her friends.