"Active Heart" (アクティブ・ハート; Akutibu Hāto) is a theme song from the anime OVA series Top o Nerae! GunBuster, performed by Japanese idol Noriko Sakai. Written by Hiromi Mori and Eiji Nishiki, the song was originally released on Sakai's 1988 album Lovely Times: Noriko Part III. It was used as the opening theme of episodes 1-3 and the ending theme of episode 4.
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