 If you liked
Kidou Shinseiki Gundam X
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 ...then you might like
Erementar Gerad
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It's similar to the protagonist that protects one girl and loves in the end of the story. Garoad and Coud had similar attitude but it differences in the situation of the story. Tifa and Ren are quiet person and doesn't understand the feelings of human. So they are the love pair with the same promise to fulfill.