his paternal grandmother was a shinpa actress Hideko Azuma, and his uncle Koji Shima was a movie director.

[2] Yuaasa began work at a young age as a child actor,[1] while some of his careers were cancelled due to the World War II.

[1] Yuasa joined Daiei Studios in 1955 and became director in 1964 with the musical comedy film If You're Happy, Clap Your Hands (jp).

[2][3] Yuasa's next project was a film tentatively tiled Giant Horde Beast Nezura which would involve real rats crawling over miniatures of cities.

[1] Following the collapse of Daiei in 1971, he predominantly directed work for television, such as Electroid Zaborger, Iron King, and Ultraman-related productions; Princess Comet, Ultraman 80, and Anime-chan (jp) where Ultraman 80 instead influenced the production of the Heisei Gamera trilogy by Tokuma Shoten although Yuasa was critical of the trilogy.

[1][5] At the bankruptcy of Daiei Film, Yuasa allegedly destroyed suits and models of Gamera productions due to frustration and distress.