At the end of the Heian period, Musashibo Benkei, a warrior monk who hated the Heike clan, was humiliated by his fellow monks and left the mountain monastery. Soon, Benkei competes with the Heike warriors on the Gojo Bridge in Kyoto and takes away their swords. One night he tried to stop a young man who had a beautiful sword on his belt and fought him, but he could not win. Knowing that this young man Ushiwakamaru (Minamoto no Yoshitsune) is looking for an opportunity to overthrow the Heike clan, Benkei asks him to let him join him.