神秘の漫画

オカルト好きの中学二年生・佐渡イオは”教室には居るが絶対に気づかれない”怪奇現象・出席番号０番と出会う。０番との束の間の楽しい学園生活を送る中、突如二人は異界へ漂流し…！？　教室で出会った二人が、セカイを揺るがすーー青春オカルトバトル開幕！！

The setting of Fate/Apocrypha is a parallel world to Fate/stay night where the Greater Grail was removed from Fuyuki after the Third Holy Grail War and disappeared for many years. Around the 2000s, around the same time as the Fifth Holy Grail War would have happened, the group that plundered the Grail, Yggdmillennia, openly declares their secession from the Mages Association and that they are in possession of the Grail. The Association dispatches fifty magi to retrieve it, but all but one are instantly slaughtered by Lancer of Black. The one remaining manages to activate the reserve system of the Greater Grail, allowing for the summoning of fourteen Servants in total.