Opfert eure Herzen!

Opfert eure Herzen! (心臓を捧げよ!) 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.

Complete version
Kore ijou no jigoku wa nai darou to shinjitakatta Saredo jinrui saiaku no hi wa itsumo toutotsu ni Tobira wo tataku oto wa taezu hidoku busahou de Manekarezaru saiyaku no hi wa akumu no you ni Sugishi hi wo uragiru mono yatsura wa kuchiku subeki teki da Ano hi donna kao de hitomi de oretachi wo mitsumeteita? Nani wo sutereba akuma wo mo shinogeru Inochi sae tamashii sae kesshite oshiku nado wa nai Sasageyo! sasageyo! shinzou wo sasageyo! Subete no gisei wa ima kono toki no tame ni Sasageyo! sasageyo! shinzou wo sasageyo! Susumu beki mirai wo sono te de kirihirake Sugishi hi wo itsuwaru mono yatsura wa zouo subeki teki da Ano hi donna koe de kotoba de oretachi wo katatteita Nani wo manabeba akuma wo mo hofureru? Gijutsu demo senjutsu demo subete muda ni nado shinai Sasageyo! sasageyo! shinzou wo sasageyo! Subete no doryoku wa ima, kono toki no tame ni! Sasageyo! sasageyo! shinzou wo sasageyo! Utau beki shouri wo sono te de tsukamitore! Etai no shirenai bakemono ga hito to nita tsura wo shiteyagaru Kono yo kara ippiki nokorazu yatsura wo kuchiku shiteyaru Saisho ni iidashita no wa dare ka? sonna koto oboechainai ga Wasurerarenai ikari ga aru kanarazu kuchiku shiteyaru Aa... erabikuita michi no saki wa donna basho ni tsunagatteiru? Tada... sasagererareta inochi wo kate ni saku toutoki higan no Sieg Yakusoku no chi wa rakuen no hate Ano hi jinrui wa omoidashita Yatsura ni shihai sareteita kyoufu wo Torikago no naka ni torawareteita kutsujoku wo Tasogare wo yumiya wa kakeru tsubasa wo seoi Sono kiseki ga jiyuu e no michi to naru Sasageyo! sasageyo! shinzou wo sasageyo! Subete no kunan wa ima kono toki no tame ni Sasageyo! sasageyo! shinzou wo sasageyo! Hakanaki inochi wo moeru yumiya ni kaete Sasageyo! sasageyo! shinzou wo sasageyo! Hokoru beki kiseki wo sono mi de egakidase

Opening Animation
On a stone ground, a statue of a saintly woman holding a child lays on its side. Surrounding the statue is a ruined city filled with ravenous Titans. A crowd of stationary people stand juxtaposed against a horde of advancing Titans.

In a brightly lit room, Eren equips himself with omni-directional mobility gear, placing his father's key within his shirt. Elsewhere outside, Titans by the dozens wander the wilderness. In a room similar to Eren's, Armin slips his foot into his military boot and Mikasa wraps her red scarf around her neck. In a ruined city up in flames, Titans wander. In the building where Eren and Mikasa are equipping themselves, Sasha helps Conny put on his ODM gear while Reiner beckons to Bertholdt. Levi dons his signature cravat and Hange equips her goggles as Commander Erwin stands outside in the uniform of the Scout Regiment.

Against a brick wall, Christa turns to face someone out of sight as memories of her with Ymir can be seen upon the wall. Ymir also stands against a wall, which shows a vision of a Titan eating a young boy. Outdoors, the Armored Titan marches forward, and Eren's Titan form collapses as it is swarmed by a group of smaller Titans. In Wall Sina, the Wall Titan peers through the ruined stone and a crowd of civilians watches the departure of the Scout Regiment, marching through a long line of illuminated stone columns. Titans consume innocents in the city as the soldiers prepare their ODM gear, standing atop the Wall proudly before drawing their blades and descending into the Titan horde.

Atop the Wall, many Scout Regiment flags fly in the breeze, and the top ten graduates of the 104th Cadet Corps along with Armin stand in salute with glowing hearts. Upon a bed, an elderly hand gently holds the hand of an infant, while elsewhere the Garrison fires upon a Titan at a defensive line.

In an open field, an explosive burst of energy shakes the land, destroying a nearby house. When the dust clears, the Colossal Titan stands beside a mountain, swinging its enormous arm to bring the mountaintop soaring in pieces to the ground below where the Scout Regiment charges forward on horseback. As Jean dodges a flying boulder, Mikasa soars forward on her ODM gear past Sasha to Eren, taking his arm and launching him forward towards the Armored Titan. Biting his hand, Eren transforms into his Titan and charges the Armored Titan, the two monsters raising their fists for battle with hearts aglow.

Across the world, the hearts of many living creatures both living and extinct, bacterial and animal, glow brightly while images of events to come flash by. On a field covered in humans with glowing hearts, the Beast Titan charges forward alongside monstrous animals and dinosaurs, all with hearts glowing brightly. As the humans are flattened in their advance, their hearts go dim.

The ruins of the city with the fallen statue stand empty of Titans. As Eren opens his eyes within his Titan, the fallen statue remains in its place weathered by time.