While chasing down a monster on Earth, intergalactic law enforcer Birdy ran into a young man named Tsutomu. Unfortunately, he was killed during the incident. Birdy's superior tells her that she must bond with Tsutomu in order for him to live out his life. So Birdy and Tsutomu become one. However, Birdy still has to stop criminals.

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Alternative version: Tetsuwan Birdy Decode