Tsukimi (Rena Nounen) came to Tokyo to become an illustrator. She is crazy about jellyfish. Tsukimi is not very confident and she hesitates around men or attractive people.

She lives in the communal apartment Amamizu kan where men are not allowed. At the Amamizu kan, only otaku women, who belive men are not needed, live there. 

One day Tsukimi gets into trouble at tropical fish shop. At that time, a stylish woman helps Tsukimi, but, in fact, the pretty woman is Kuranosuke (Masaki Suda) a male university student. Kuranosuke dresses like a woman because he was raised at the side of his powerful politician father and he does not want to become a politician.

Kuranosuke becomes interested in Tsukimi and Amamizu kan. He visits her at the apartment and hangs out with her. Tsukimi keeps his secret from her neighbors. Kuranosuke helps Tsukimi improve her appearance and she starts to change.