Traveling merchants have been attacked by vicious robbers. Wasabi, Namida, and Tsubaki of Team 15 are sent to the site of the incident to investigate. Tsubaki finds a clue that seems to point to samurai from her homeland, the Land of Iron. Furthermore, the clue belongs to a certain person that makes Tsubaki tremble in fear. That person is someone that she respected long ago, a fellow apprentice with whom she trained and honed her swordsmanship with—someone with whom Tsubaki shares a certain fate!
Even if it was just a coincidence,
Auch wenn es nur ein Zufall war,
Aunque fuera un golpe de suerte,
Aunque fuera un golpe de suerte,
Per quanto sia stata 
un'unica miracolosa coincidenza,
Mesmo que seja só coincidência,
Пусть и по чистой случайности…