Kyoukai no Kanata: Shinonome

Taking place three years before the TV series, episode zero follows Hiroomi Nase's mission to subdue the infamous half-human, half-youmu Akihito Kanbara. Curious about the mission, Hiroomi's little sister, Mitsuki, tags along with him, and the siblings meet Akihito for the first time. However, they soon discover that they aren't the only ones seeking out Akihito, and thus begins the story of Kyoukai no Kanata.(Source: MAL Rewrite)

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Kyoukai no Kanata: Shinonome (Beyond the Boundary: Daybreak

Kyoukai no Kanata: Shinonome

Beyond the Boundary Episode 0, OVA

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Daily Anime Pick #62 - Kyoukai no Kanata — Steemit

Kyoukai no kanata shinonome-00

Kyoukai no Kanata - Nase Siblings <3 Source: Episode 0 Shinonome

Kyoukai no Kanata: Shinonome

Spoilers] Kyoukai no Kanata Rewatch - Shinonome (Discussion) : r/anime

Kyoukai no Kanata: Shinonome (Beyond the Boundary: Daybreak