本作为平成假面骑士系列第15部纪念作,及纪念原作者石之森章太郎诞生75周年的首部剧场版。
魅影余党之一的食人魔作乱,为了令自身力量变得强大而把同类当作饵食,指环之魔法使操真晴人(假面骑士巫骑)因体内寄宿魅影的关系而被对方盯上。再次赴上战场迎战时,本已逝去的历竟然出现在面前并变身成为白色魔法使。。Avery Malone, a wannabe writer and lonely librarian, gets her big break when she's hand-selected to assist her hero, reclusive author, Caleb Conrad. Whisked away to Caleb's remote estate, Avery is given her one and only task| to participate in a controlled psychological experiment in fear that will serve as the basis for Caleb's next novel.。