甫升上高中的我所一见钟情的黑发少女──观田明日香学姊竟是被视为「告知绝对无从回避之不祥事态的魔女」而令全校师生感到畏惧的存在。得知学姊怀著「自己做过的恶梦百分之百都会成真」的烦恼之后，我不顾身为我表姊，同时也是学生会长的沙耶姊之劝阻，毅然决定为了改变学姊的未来而展开行动！然而数不清的偶然事态却一再阻止我……我与学姊的命运究竟将何去何从呢！？

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