The story tells of the mysterious Mountain Windmill that holds mysteries long since forgotten by the villagers who live in its shadow. The journey to the windmill is too dangerous to travel, until, that is, a young village boy discovers a map marking a hidden route to the Windmill. The Ocean House is the home of the boy.

One of the aesthetic 'design pillars' of the theme is the combination of nature and man-made structures. The other is a vivid and rich palette.