Once upon a time, on Tsuki island, there was a beautiful lake in the Northeast of the Münbichi (Moon Beach) called Tsuki no mizūmi (Moon Lake), and there was a village where the Yūki tribe settled west of the lake it is called Minori. There was a man named Satoshi Satoru who lived at the edge of the village. Satoshi has been frustrated lately, and it's because he just lost everything. His parents were dead years ago, and his farm has been invaded by an unknown clan from the East called Yoru no hebi.