Revealed to be a "half-youmu" and effectively immortal.
The episode begins with protagonist Akihito Kanbara attempting to "save" a girl, Mirai Kuriyama , from jumping off the school roof. Instead of thanking him, Mirai leaps over a fence and stabs him with a sword made from her own blood. Unique Identities: Kyoukai no Kanata Episode 1
A First Impression – Kyoukai no Kanata Episode 1 - Moeronpan Revealed to be a "half-youmu" and effectively immortal