The Lore and Legends of SRW: Tadao Nagahama's Super Robot Romantic Trilogy
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Published on ● Video Link: https://www.youtube.com/watch?v=nkPmOnvlb68
In order, it's Combattler V, Voltes V and Tosho Daimos
Link: http://en.wikipedia.org/wiki/Ch%C5%8Ddenji_Robo_Combattler_V
or: http://www.animenewsnetwork.com/encyclopedia/anime.php?id=1991