 If you liked
Koukyoushihen Eureka Seven
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 ...then you might like
Clannad: After Story
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These anime are both very similar in the way that the male and female protagonist meet and an instant connection forms, and it almost seems they were "destined" to meet. Also, as the story progresses you see the relationship grow stronger. Both anime have a very emotional side to them, which really make you connect to the characters and their actions.