( From the anime Samurai Champloor.)
A samurai greatest honer is to die at the end of the blade.
Once upon a time the Gods and the humans used to work and live together. The Gods were the protectors of the humans and the humans worshiped the Gods. Relationships between the Gods and the humans were common and Demigods also lived among the people. It was the Demigods that started the wars.
The Demigods began calling themselves the Gods and began trying to get the humans to worship them just like how they did the pure Gods. But the Gods didn't like the Demigods taking away the attention and so an uproar began and the Gods waged war on the Demigods.
Seeing their friends and families being killed by the Gods, the humans decided to join in the fight against the Gods. They wished to restore peace and harmony but peace can't be archived through war, and so the war raged on.
The Clans
Kamison
The Kamison wear a black headband.
The Kamison are mainly made up of Gods. They are fighting to wipe out the Demigods but are also fighting back against the humans by trying to take over Nishikaku city which is owned by the Shinkin.
Hanshin
The Hanshin wear a red headband.
The Hanshin are mainly made up of Demigods. They are fighting against the Kamison in an attempt to get more priorities and respect from everyone. They often don't value human lives because they see themselves as being worth more.
Shinkin
The Shinkin wear a white headband.
The Shinkin are made up mainly of humans. They are fighting to protect their city (Nishikaku) and to restore the peace among the humans, Gods and Demigods.