 If you liked
Koukyoushihen Eureka Seven
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 ...then you might like
Mugen no Ryvius
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I couldn't help but think of Infinite Ryvius while watching Eureka Seven. Although very different shows, the characters, interactions, and development between the two casts are very comparable. Both shows manage to develop a large cast very well, both with younger teen leads. There's also a lot of angst in these shows, but hey, people have issues right? The payoff for both is really incredible.