Late Kamakura Era. Ishi, a slave-like servant exploited by merchants, unexpectedly encounters Saru, a mysterious man captured by samurais. The two cooperate and manage to gain their freedom. However, the words that come from Saru's mouth are unbelievable: “We are about to begin a battle of 700 against 2.”. The curtain opens on a shocking historical action story that shatters the slumber of peace!