Due to a rebellion by Kurohara Genma, the evil chief retainer of Mikazuki Castle, the castle lord, Chiemori, and his men are driven out of the castle and killed, leaving only his wife and two children behind. Luckily, his wife and children escaped, but they are no longer known, along with Mikazuki's helmet... Thirteen years later, a boy appears at a tournament in front of the lord of Mikazuki Castle, and it is none other than Mikazuki Shinpei, who has come to avenge his father, Chiemori. Will Shinpei be able to avenge his father and reclaim Mikazuki Castle?