was a Japanese poet, lyricist, and literary scholar. Saijà Â, Hakushà « Kitahara, and Ujà  Noguchi are considered to be the three great poets and children's songwriters in Japan.
Saijà  was born in Tokyo. He graduated from the Waseda University Department of English Literature. During his studies, he published works in publications such as and became a member of the literary group. He was influenced by Irish literature.
In 1918, Saijà  co-founded the children's literary magazine and published the children's song . He continued writing children's songs, becoming one of the leading children's poets of the Taishà  era. His first poetry collection, titled , was released in 1919. It was followed by a collection of translated poems, , in 1920.
From 1924 to 1926, Saijà  studied at the Sorbonne University. After returning to Japan, he became an assistant professor in the French Department at Waseda University. Eventually, he was appointed a professor.
Aside from children's songs, Saijà  also wrote lyrics to popular and military songs. Some of his songs include "Tà Âkyà  Kà Âshinkyoku" (1929; performed by Chiyako Sato) and "" (1933). "Tà Âkyà  Kà Âshinkyoku" has been described by as a "verbal caricature of scenes of modern Tokyo life".
Following the Second World War, Saijà  left Waseda University and devoted himself to studying Arthur Rimbaud. He became the first chairman of the . He also served as a chairman of the Japanese Society for Rights of Authors, Composers and Publishers. In 1968, he was awarded Order of the Sacred Treasure (3rd class).