After a disastrous turn of events in a battle, Delta ends up being the sole survivor of Wight's Brigade, and inherits the captaincy. The difficult choice she has to make about joining another unit, or rebuilding the brigade is cut short when Zipper, a energetic spearwoman demands to join. The law limits mercenary brigades to six swords, so they begin the long journey to find another four suitable people, picking up what odd jobs they can.