Kyoukai no Kanata: Shinonome  

Beyond the Boundary: Daybreak, Beyond the Horizon: Daybreak, 境界の彼方 ＃0「東雲」

Before the tv series started, there was an episode called zero which focused on hiroomi nases mission to control the notorious half-human, half-youmu akihito kanbara. intrigued by his task, hiroomis younger sister mitsuki joined him, and they encountered akihito for the first time. however, they soon realized that they were not alone in their pursuit of akihito, marking the beginning of kyoukai no kanata's narrative.