A Cruel Angel's Thesis is the legendary opening theme song for the groundbreaking anime series Neon Genesis Evangelion. Composed by Shirō Sagisu with lyrics by Neko Oikawa and performed by Yoko Takahashi, the song perfectly captures the series' blend of apocalyptic drama and psychological depth. Its powerful fusion of pop, rock, and orchestral elements, combined with its instantly recognizable trumpet fanfare, has made it an enduring classic in anime culture.