Originally Performed by Hironobu Kageyama, "Kokoro wa Tamago" (こころはタマゴ) is the ending theme for Choujin Sentai Jetman.
Chojin Sentai Jetman (鳥人戦隊ジェットマン, Chōjin Sentai Jettoman, Birdman Squadron Jetman) is a Japanese tokusatsu television series produced by Toei Company. It is the fifteenth entry of the Super Sentai metaseries, following the previous series Chikyu Sentai Fiveman. The series aired on TV Asahi on February 15, 1991, to February 14, 1992, with a total of 51 episodes replacing Chikyu Sentai Fiveman and was replaced by Kyōryū Sentai Zyuranger. It was the last Sentai series until Ressha Sentai ToQger to not get adapted into a Power Rangers series. It was also the first series to have a third robot, Tetraboy and paid tribute to the anime series Science Ninja Team Gatchaman. The international English title is listed by Toei as simply Jetman.