 If you liked
Blue Gender
|
 ...then you might like
Koukyoushihen Eureka Seven
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Girl with no emotions pilots a Mecha-type machine, either way the girls meet the boy, and emotions appear. Also major character development in both boy and girl.
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Recommended by AceTheHanyou
These are both mecha anime where a guy is dragged into a complex situation by a seemingly emotionless girl who he develops feelings for.
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Recommended by LoveLikeBlood