Criminals rule the desert village of Ushiro, bribing the corrupt police to turn a blind eye. Bowing one's knee in surrender was the logical choice for Hiro, a melon farmer who doesn't want any trouble for his family. That is, until an encounter with two mysterious girls ensnares him to join the criminal organization, Lionheart. Though reluctant at first, Hiro now seeks their strength to protect the ones he loves.