Mamoru Sasaki was a remarkably prolific writer, leaving his mark on both the film and television industries. His extensive body of work included collaborations with the renowned director Nagisa Oshima, resulting in the creation of films like "Death by Hanging" in 1968. Additionally, Sasaki maintained a long-standing association with Tsuburaya Productions, contributing to their fantasy series such as "Urutoraman" in 1966, "Urutora Sebun" in 1967, and other science fiction-oriented television programs.
Throughout his career, Sasaki was celebrated for his exceptional imagination and his unique, offbeat sense of humor. It's worth noting that, aside from his work with Oshima, Sasaki frequently collaborated with the accomplished film and television director Akio Jissoji, with whom he shared a strong creative bond.