Kayo is a normal girl living with her dad in Edo. They also own a small restaurant. One day, some samurai from the Bakufu ask her to take the place of Princess Hisa in the bridal procession to Sunpu Castle because they look exactly alike. Due to the shortage of crops from the bad weather, business has been poor, so she takes up the offer. They’re also being threatened and Kayo doesn’t want anything to happen to her dad. Along with some people from Bakufu, six samurai come along as bodyguards. However, the hidden goal of this trip is actually to carry one of Tenga Goken (Five Greatest Swords) to the destination for the Gozenjiai (Sword Tournament).