A Medieval Knight resurrects to fulfill his vow and bestow a blood-thirst vengeance upon the kindred spirits of those who betrayed him long ago. In the course of one night, identities will be revealed, destinies met, and a poetic justice of the macabre maniacally served. Here lies a tale of passion, loyalty, deceit, betrayal...and revenge. They were Warriors. They were Crusader...。神秘组织·GOD看中了神敬太郎博士的人类工学技术,逼迫其加入,教授拒绝而遭袭击,儿子神敬介也被杀害,身受重伤的父亲为了让儿子复活,不顾自己的伤势,亲自执刀为儿子进行改造手术。敬介醒来后,父亲已死,透过计算机留言,敬介了解GOD欲危害世界的阴谋,于是背负起对抗邪恶的责任,成为第五号的假面骑士·假面骑士X。。