No one can resist lust... A continent located in the far east of the world. The land called "Hinomoto" was under threat from demons led by one of the demon kings, the Hungry Demon King Kikin. Kikin and their demons attack humans to satisfy their own "lust". Women who are attacked by the demons "turn into beasts" and desires to be raped until they become pregnant, while men who are attacked by Kikin "turn demons" and turn into lust-hungry demons. In this desperate situation, there are those whose mission is to fight and destroy demons in secret. These are the female ninjas led by Aoba, the leader of the Aoi clan. Called kunoichi, they fight every day to destroy the demons. One day, Tsumugi is ordered by Aoba to capture Kikin alive. Tsumugi captures Kikin alive with the secret technique of the Aoi clan, but... "Aoba's hidden desire," "Kikin's unfulfilling desire," and "Tsumugi's explored desire" all blend together and devour Hinomoto.