Fuu is a lonely girl from the lowest stratum of life. Her only friends are Asa, a little bird, and an old radio she found in the corner of a junk shop. Then there is Kazakura, a hungry girl who goes at her own pace. From the moment they first meet, she calls Fuu "big brother" and follows her around with a cheerful smile. The place where they meet is the only remaining human country in the world. In the middle of an endless desert ruled by deformed monsters, human beings must live for the king, the messenger of God, taking pleasure in daily hardships. But the world they know is all a big lie. With a lot of wisdom and a handful of courage. Now, the "world's heaviest escape drama" begins. (Source: Kadokawa, translated)

The grim city of Oosaka is controlled by the Yakuza. On the secluded artificial island of Sakishima, there exists a rumour: There is a "wolf" out hunting the Yakuza. This wolf would use a demon sword to slay the Yakuza's dignity. That is, this sword has the ability to turn them into little girls!!!! A tale of the high-school student who hunts Yakuza and the former-Yakuza girl! These pretend-siblings with a bond too strong will face the Yakuza infesting Oosaka. This is a battle-filled and action-packed story of chivalry featuring big twists and turns!!!