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An academy student, Taki Minase, finds a strange book while exploring an abandoned room in the school's basement. With the help of his cousin, he translates the Latin-French writings and finds them to be instructions for dark magic, which is actually a form of Kabbalistic satanism (the translation was not mentioned in the OVA).

Based on Itosugi Masahiro's incest themed romantic drama manga <i>Aki Sora</i> serialised in the seinen magazine <i>Champion Red Ichigo</i>. <i>Aki Sora</i> revolves around Aoi Aki and Aoi Sora, a pair of close siblings who have shared an intimate bond since childhood.