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