Education
Yashiro entered the Tokyo Music Academy (presently the Tokyo National University of Fine Arts and Music) in 1945, where he studied composition under Kunihiko Hashimoto, Yujiro Ikeuchi, Akira Ifukube, and Tomojirō Ikenouchi, and piano under Noboru Toyomasu, Leonid Kreutzer, and Kiyo Kawakami.
Career
Upon finishing graduate courses in 1951, he went to Europe with Toshiro Mayuzumi to study with a French governmental fellowship at Paris Conservatory. There he learned composition and orchestration from Olivier Messiaen, Tony Oban, and Nadia Boulanger. He returned home in 1956.
In 1968, Yashiro was inaugurated as an assistant professor at his alma mater, and he was promoted to professor in 1974.
He died suddenly of heart failure at the age of 47.