During the years of wandering by Miyamoto Usagi, an invisible evil entity has followed our hero step by step. Since the dramatic events of Grasscutter, the demon Jei occupies the spirit of warrior Inazuma, with the intention of ending usagi. Bakuchi, humiliated, incapable of avengeing the death of his son, doubles the bonus on the head of Inazuma. The money attracts a large number of bounty hunters, unaware of being sparrows facing an eagle. This man hunt also attracts Usagi, the hunters Gen and Dog Errant, and a mysterious stranger named Isamu, each with his own motivations. This new epic reveals the origins of Jei.