Kyoukai no Kanata Episode 0: Shinonome(4319)

Other Title(s)境界の彼方 新作エピソードは#0「東雲」
Genre(s)Fantasy, Slice of Life, Supernatural
SynopsisBundled with seventh Blu-ray/DVD volume of Kyoukai no Kanata.

Episode 0 happens two years prior to the TV series when the Nase siblings meet Akihito for the first time in a mission for Hiroomi. Mitsuki follows her brother on this mission and their goal is to subjugate Akihito.

(Source: MAL News)