In Edo in the mid-1800's, fireworks maker Seikichi Tamaya and his friends struggle to live under the harsh morality laws imposed by the strict city councilor, which ban all luxuries, including fireworks. One day, a strange girl stops by Sekichi's shop with an equally strange request: she wants Sekichi to build a firework that can reach the moon.
The Imperial Seal has been passed down through the generations since ancient times. It confers great power unto the warriors that it chooses. This is the story of those warriors.
It is a time of chaos and of civil war. It is a time when great armies clash in titanic battles and great heroes carve their names in history. It is also a time of death and destruction, when the people of the land live in constant fear of the sword. Onto this stage steps the reluctant Rikuson (Lu Xun), whose family had been the guardians of the Imperial Seal up until it was stolen by Sonsaku. At the behest of his mentor Rikuson offers his services to Sonsaku with the intention of confirming the will of the Imperial Seal. However, assassins strike down Sonsaku and the Imperial Seal is lost. So begins, Rikuson’s journey to recover the Imperial Seal and discover his destiny.