Because of the success of the first manga, a radio dramatization was created. A serial drama, the "Princess Knight" adaptation was broadcast on Radio Tokyo between April 4, 1955 and September 26, 1955. Almost thirty years later, a theater adaptation of the manga was created by the company Dengeki, running from July 5, 1984 to July 17, 1983. It played at Parco Space Part 3, was directed by Mitsumasa Shinozaki, written by Tsutomu Mukai, and starred Ran Ito. Another musical came in 1998; it was directed by Shunsaku Kawake, written by Kensuke Yokouchi, and starred Yoshihiko Inohara, Sae Isshiki and Ranran Suzuki. Yokouchi wrote another play and directed it himself; it was staged at Kanagawa Prefectural Youth Center in 2011, and starred Mikan Asakura. Yokouchi was also the screenwriter for two other stage adaptations in 2014 and 2016; both were directed by Masanari Ujigawa and staged at Rikkōkai Hall. The former starred Haruka Katayama and Aya Kamiki, while the latter featured Hirono Suzuki and Yui Itō.