Jellyfish otaku Tsukimi (月海?) lives in a shared bath and toilet, women-only apartment, Amamizukan. Inhabitants include fujoshi, NEETs, and others who consider fashion their natural enemy, calling themselves "Amars". One day, Tsukimi meets a fashionable beauty who saves a jellyfish that is about to die. In reality, the "girl" is a cross-dressing man evading inheritance of his father's occupation.