 If you liked
Terra Formars: Bugs 2-hen
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 ...then you might like
Shingeki no Kyojin: Kuinaki Sentaku
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Terra Formars Bugs 2 and Attack on Titan: No Regrets are both prequel OVAs about the backstory of a main character. Both OVAs show the tragic past of the character. The threat in both series are a human like species who cannot communicate with humans. This species also wants to understand human technology, while being physically stronger than humans.
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