This song is ending song of Kara no kyoukai 3 - Tsuukaku Zanryuu

sang by Kalafina, a vocal group created by Japanese composer "Yuki Kajiura"

I think from all of Kara no kyoukai episode, Kara no Kyoukai 3 one of the most epic ep.. it's a crazy and insane episode :)

I love this song, watch below to listen it

KALAFINA - ARIA