Do As ~Muraosa no Iinari~

After losing her parents in a sudden accident and being left with no relatives, Suzune is taken in by the chief of the village where she lived as a child. When she arrives, she finds her childhood friend (the protagonist) there, bringing back nostalgic memories. By the protagonist's side is his grandfather, the hereditary village chief, who eyes her lecherously. The village chief assigns his grandson a certain role. The village has a certain custom that has continued for over 300 years in order to ensure the perpetuation of descendants...