A Choice with No Regrets (Pt. 1) is the fourth OVA episode of the Attack on Titan anime. It was produced by Wit Studio and Production I.G, and is based on the spinoff manga Attack on Titan: No Regrets (Shingeki no Kyojin Gaiden: Kuinaki Sentaku) by artist Hikaru Suruga and writer Gan Sunaaku. This prequel to Attack on Titan answers the questions: How did Captain Levi of the Survey Corps go from street tough to humanity's strongest soldier? And how did Commander Erwin become a cold, calculating leader, ready to sacrifice anything to save the human race? The fires that forged this bond of loyalty and trust were intense indeed!