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.

(Source: Kodansha Comics)

Shoko has turned 30 and she has finally given up on finding a marriage partner. Recently having completed a year long contract, she wants to explore the freedom her lack of relationship and job obligations afford her and books a trip to Seoul, Korea. Unencumbered, she wants to visit the Korean BBQ restaurants alone and drink to celebrate her "graduation from marriage seeking activities."

Not quite supportive is her sister, one who is already married to a good-looking, high earning man, who thinks Shoko should do the responsible thing and give marriage hunting a shot again. But Shoko cannot be deterred.

But life has a strange way of turning things around. On her trip to Seoul, Shoko makes a surprising discovery, and an unexpected connection...