Heian-Jidai's 12th century period many internal tensions occur with the increasing power of the clans increasing alongside the imperial court, where mysterious supernatural phenomena occur. Over the years, two powerful clans have fought intense conflicts overpower. Where one of them led by the legendary Shogun Hōjō Tokimasa achieved great and important victories against the other enemies. However, regional leaders continued to have great power and influence. Where they made a secret alliance with occult forces to defeat and assassinate the legendary Shogun and takes his post from him as military chief. However, after his assassination he all military power was placed in the hands of his daughter Hōjō Masako. Genpei's war with Masako then begins, with a mission to defeat all enemy demons and clans that conspire to assassinate the legendary Tokimasa.