 If you liked
Zettai Muteki Raijin-Oh
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 ...then you might like
Yuusha Exkaiser
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The Yuusha (Exkaiser and sequels) and Eldran (Raijonoh and sequels) series were direct competitors at release and featured similar elements. Both feature episodic stories with just a simple overarching storyline, huge robots, sympathetic clumsy antagonists, protagonists in a school setting and enjoyable daily life stories usually leading an action packed ending. Fans of one might enjoy the other as well.