A group of young otaku women, each with their own specific area of interest, all live together at an apartment complex called “Amamizukan” in Tokyo. In general the women tend to shun the need for having any men around, and thus refer to themselves as “Amars” (nuns).

One day, aspiring illustrator Tsukimi Kurashita befriends a young woman at a local tropical fish shop who actually turns out to be a cross-dressing young man named Kuranosuke. Soon, Amamizukan is threatened with demolition and Kuranosuke begins helping the girls become successful in order to save their beloved apartment building.