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He was born in Akita, Japan, 1936. Studied
haiku writing under Koji Nagata. While still
in his teens, bocame a menber of the haiku
magazine Bokuyoshin edited by Shuji Terayama. Member of the
Riraza Groupe, Haiku-hyoron, and Unicorn. He pursues the Oriental chaos in his haiku.
Currently member of the Ki groupe. He published many haiku collection
including Seinen-kyo(1963), Sekinai-gaku(1967), Chusui-kan(1971), Afu-gaku(1974), Mitsubo-shu(1979), Reika(1982), Complete Haiku Collection of Koji Yasui(1993), Kuhen(2003), etc. His essays; Modoki Shokon(1974). Shozen Ikku(1977). In 2003, he won the 1st Ginyu Haiku Prize for the haiku collection Kuhen.