Kamen Rider The mysterious organization GOD took a fancy to Dr. Kami Keitaro's human engineering skills and forced him to join. The professor refused and was attacked. His son Kami Keisuke was also killed. In order to revive his son, the seriously injured father, regardless of his own injuries, personally performed surgery on his son. After Keisuke woke up, his father was dead. Through a message on his computer, Keisuke learned about GOD's conspiracy to harm the world, so he took on the responsibility of fighting evil and became the fifth Kamen Rider, Kamen Rider X.