In ancient times, humans and dragon spirits, named Yasha, lived harmoniously on Earth. But a great war exploded in the spiritual world, caused by two of the most powerful Yasha; many dragon spirits deserted to the land of men in hopes of escaping the terrible war. Akai and Aoi, the fire and water dragon spirits, are two of the dozens who sold their souls to humans to survive.

Hundredths of years later, a girl named Yoko accidentally woke up Akai when visiting Mount Tokachi in a trip with her friends. Now, Yoko must help Akai remember his past while trying to adapt the dragon spirit to the modern life. Many interesting adventures await them, in a world where humans and Yasha reunite once again.

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