Parasyte -the maxim- - Season 1 Episode 22 Quiescence and Awakening Kill. Eat. Repeat.
Overview: Motivated by Satomi to stay alive, Shinichi resolves to fight Gotou. With Migi's support, they press their attack in an isolated forest. However, they fail to finish Gotou at a critical juncture, causing Shinichi to lose Migi and flee in defeat.