In the year 1590, powerful daimyo Toyotomi Hideyoshi nears his plan to unify all of Japan, but he comes across a floating fortress known as Oshi Castle. Narita Nagachika must use his army to defend the castle.
A princess, along with a general and two commoners evade pursuit of an enemy and his samurai cohorts. The princess and general are caught but are rescued and then destroy the enemy's fort. Set in the warring period of Japan.