This episode takes place two years prior to the anime series and begins when Hiroomi receives a request for a job from his older sister Izumi: to subdue the invulnerable half-yōmu Akihito. Hiroomi's younger sister, Mitsuki, encounters a dark silhouette in the street on her way to follow Akihito and her brother
Music video Yakusoku no Kizuna from Kyoukai no Kanata Movie: I'll Be Here - Kako-hen Blu-ray/DVD