The line comes from Attack on Titan, the anime adaptation of Hajime Isayama's manga that premiered in 2013. Early in the story, young Eren Yeager makes the vow after a Titan attack destroys his home and kills his mother, setting his revenge arc in motion. The scene became one of the series' most quoted moments as the show spread worldwide. Fans clipped the declaration for edits, parodies, and reaction posts, where it now signals obsessive determination or an exaggerated promise to defeat every opponent.