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The age of the Warring States Period, a period of constant fighting to get a small piece of land washed with blood.
At a certain point in the small mountains of the Kanto region, the vermilion of autumn leaves did not end even after the autumn, but the flourishing vermilion leaves continued forever.
At first people wondered, but gradually no one questioned it. After a while, the powerful people of the time named the era name "Kowa."
The vermilion of autumn leaves slowly spread throughout the Kanto region, and a small belief called 朱教, which believed in autumn leaves, grew among the people.
Time passed, 18 years of Kowa. When the strange fate of those who live in a harsh world mixes, the end of the era begins.