Gravion aired in Japan every Monday from October 7, 2002 to December 16, 2002 and ran for 13 episodes. Episodes 9 and 10, and 11 and 12 were shown together on the same night, leading to just an 11 week run. The opening song for Gravion was "Nageki no Rosario" by JAM Project, the ending song was "WISH" by YURIA. Whenever Gravion assembled the song "Gasshin! God Gravion!" by JAM Project would play. Gravion Zwei aired from January 8 to March 25 in Japan, running for twelve additional episodes. Both Gravion and Gravion Zwei were created and directed by Masami Ōbari.