The warlords overrun the country while the farmers are starving, and forced to become soldiers to keep the wolf from the door. The farmers are recruited in groups of fifteen. In Yaju's village, there are only twelve men, so they press Oto, who looks more like a boy than a girl, to join, disguised as a man.

戦国の世の雑兵、負けて逃げるは卑怯者、討たれて死ぬのはあほう者。昨日は南軍、今日は北軍、旗色まかせの雑兵たちがまき起こす爆笑の渦…！