In the ancient times, the Sengokuhara area of Hakone-machi, Kanagawa Prefecture, Japan was the place where the cultivated roof was cultivated. There is still an 18-hectare grassland on the north side of the Sengokuhara Plateau. Officially entering the autumn until the late autumn, the whole grassland will turn golden yellow, and it will be golden in the sunshine. Walk in it, there is a feeling of being in the golden ocean.