Opfert eure Herzen! Kanji Romaji Composer Album Number in Album Previous Track Next Track Total length Release Date Label ASIN Opfert eure Herzen! (心臓を捧げよ! Shinzō o Sasageyo!?, lit. Sacrifice Your Hearts!) is the 3rd opening theme of the Attack on Titan anime, and is sung by singer-songwriter REVO of Linked Horizon. It replaced Die Flügel der Freiheit in Episode 26.