: The Hollow Shadow attempts to possess Akihito after being momentarily weakened. Akihito convinces Mirai to stab him with her blood blade to force the creature out, reminding her of his immortality. While the Hollow Shadow is expelled and subsequently defeated, the trauma of the "near-death" state triggers a catastrophic change in Akihito.
: A post-credit scene reveals that the stone retrieved from the battle was a fake worth only 200 yen, while the real yomu crystal is presented to Miroku Fujima. Thematic Elements kyoukai-no-kanata-dub-episode-4.mp4
[Rewatch][Spoilers] Kyoukai no Kanata - Episode 4 discussion : The Hollow Shadow attempts to possess Akihito