นิยายเล่ม 15-17 ของซีรีส์ Monogatari ครอบคลุมรายละเอียด Ougi Formula, Sodachi Riddle, Sodachi Lost, Shinobu Mail ซึ่งเป็นรายละเอียดตามนิยายสองเล่มแรก
A peculiar transfer student named Ougi Oshino has simply found out Naoetsu non-public highschool. She is quickly introduced to senior student Koyomi Araragi by their mutual friend Kanbaru Suruga, in hopes of getting recommendation relating to an odd discovery she has created. when taking a glance at the schools layout, Ougi notices that a schoolroom has appeared in associate degree otherwise empty areaa place that ought to not exist. Unsure if this can be the work of associate degree apparition, Araragi and Ougi conceive to unravel the reality behind this enigma. however Araragi shortly discovers, when finding himself bolted in with Ougi, that the space holds the memory of an occasion he had lang syne forgotten.