Unko-san: Tsuiteru Hito ni Shika Mienai Yousei Junjou Ha  

うんこさん ツイてる人にしか見えない妖精 純情派, Shit Naive School

A legendary island resembling an unusually regular turd houses a population of people and animals with insanely aggressive behavior. The central character, Yoshiko Un, is known as Unko-san on this island, but it's unlikely that you will encounter her since the island only appears to the lucky few who are granted good fortune.