Kalafina

Kalafina was a Japanese vocal group formed by composer Yuki Kajiura to perform themes for the Kara no Kyoukai films before expanding into other anime music. Its principal vocalists included Keiko Kubota, Wakana Ootaki, and Hikaru Masai. The group's anime credits include themes for Black Butler and ALDNOAH.ZERO, and insert-song performance for Kara no Kyoukai Remix: Gate of seventh heaven.