The ending for Attack on Titan (Shingeki no Kyojin) Season 2 is Shinsei Kamattechan’s new song Yuugure no Tori (Bird during Dusk).
Attack on Titan Season 2 started airing on 1 April 2017. The announcement of the ending song was not revealed before the air date and the announcement was restricted to after the episode had been aired. Isayama is a fan of Shinsei Kamattechan, so using a song by them is something he wished for. The song Yuugure no Tori (TV size) was made available on iTunes and AppleMusic on 2 April 2017.
Shinsei Kamattechan also revealed they will ‘borrow’ Pony Canyon as their label. Only this double A-side single ‘Yuugure no Tori/Hikari no Kotoba’ will be released under Pony Canyon instead of their label, unBORDE. Future releases will return to unBORDE.