Follow the drum beat to encounter a group of six Mongols. Follower her and look for the purple-flowering Wisteria trees up the hill. She will ask you for help - and offer redemption.
Your family has history here - your father burned this house down. Interact with it by pressing R2 and Kodama will speak to you. As you approach, you will notice a flag outside the house. You'll find a burned house near a Fuji/Wisteria forest.
It's also close to the Zasho River Archery Challenge. This Unwritten Tale is started at a house, North of Senjo Gorge and East of Lake Nagata.