Yumeno Kyūsaku was the pen name of Sugiyama Yasumichi , an early Shōwa period Japanese author, Zen priest, post office director and sub-lieutenant. The pen name roughly means "a person who always dreams". His Dharma name was Goshin-in Gin'en Taidō-koji (悟真院吟園泰道居士). He wrote detective novels and is known for his avant-gardism and his surrealistic, wildly imaginative and fantastic, even bizarre narratives. His eldest son, Sugiyama Tatsumaru, was known as the Green Father of India for spending billions of yen on reforestation.

The Dark/Black Ocean Society was an influential Pan-Asianist group and secret society active in the Empire of Japan.