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Stepbrothers Kohtaro Minami and Nobuhiko Akizuki were taken by the cult Gorgom on the night of their 19th birthday and put through cyborg surgery so that they could be candidates for the next Gorgom Creation King. Both of them are called Century Kings, and the last battle between them will decide who becomes the next Creation King. With the help of his foster father, Kohtaro got away before he was brainwashed, which is the last step of the surgery. He then turned against Gorgom. Soon, his stepfather tells him the terrible truth: Gorgom killed his real parents. Kohtaro and Nobuhiko were called "Black Sun" and "Shadow Moon" because they were both born on the day of a solar eclipse. Taking on the name Kamen Rider Black, Kohtaro was determined to save his stepbrother from Gorgom and protect Japan at the same time. But later in the series, Nobuhiko became Shadow Moon and fought Kohtaro. The winner of that fight became the next Creation King.