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)

Kyoukai no Kanata: Shinonome (Beyond the Boundary: Daybreak

List of Episodes, Kyoukai no Kanata Wiki

Kanata Shinonome, All Worlds Alliance Wiki

Kyoukai no Kanata Shinonome : r/watchinganime

Beyond the Boundary - Wikipedia

Kyoukai no Kanata: Shinonome (Beyond the Boundary: Daybreak

Kanata, Sakura, Anime

Daybreak, Kyoukai no Kanata Wiki