Seijirō Kōyama is credited as an original creator, director, and scriptwriter for the anime film Ise-wan Taifu Monogatari. This work, also known as Isewan Typhoon Story or simply The Typhoon, is a 1989 Japanese animated movie produced by Mushi Production. The film commemorates the 30th anniversary of the Isewan Typhoon, a powerful and devastating storm that struck the coast of Japan on September 26, 1959, resulting in thousands of casualties and injuries. Kōyama's role encompassed both writing the original story and directing the film, which was released in Japan on November 4, 1989. The project stands as a historical drama focused on the personal and communal impact of a national disaster, reflecting a documentary-style approach to animation that captures a specific tragic event in 20th-century Japanese history.