Kyoukai no Kanata Episode 10: She was the sacrifice??

[HorribleSubs] Kyoukai no Kanata - 10 [720p].mkv_snapshot_09.44_[2013.12.05_06.16.35]

Oh snap…it was her plan all along! It looks like Mirai sacrificed herself to keep Akihito alive. But doing so required accepting Kyoukai no Kanata into her own body. However, judging by the end of the episode, she’s still alive and currently fighting inside that dark sphere floating over the city. How very convenient for her not to have died after her entire body vanished.

Anyway, it looks like Akihito will have to go save her and help her defeat Kyoukai no Kanata. Will they be able to kill it or will it just continue living dormant inside one of them? I mean, how much help can Akihito really be now that he’s no longer immortal? Also, will we ever find out how exactly Akihito came to be inhabited by Kyoukai no Kanata? Are we really to believe he was born with it?