Watch Kamen Rider Black Free Series Online on GOKU

On the night of their 19th birthdays, the cult Gorgom kidnapped stepbrothers Kohtaro Minami and Nobuhiko Akizuki and forced them to have cyborg surgery so that they could be candidates for the next Gorgom Creation King. Both of them are called Century Kings, and they're destined to beat each other in a final battle. Whoever wins will become the next Creation King. Kohtaro got away before he was brainwashed, which is the last step of the surgery. His foster father helped him do this, and he turned against Gorgom. Soon, his stepfather tells him the horrible truth: Gorgom killed his real parents. Since both Kohtaro and Nobuhiko were born on the day of a solar eclipse, they were called "Black Sun" and "Shadow Moon." Kohtaro, using the name Kamen Rider Black, was determined to save his stepbrother from Gorgom while protecting Japan. But later in the series, Nobuhiko turned into Shadow Moon and fought Kohtaro. The winner of that fight became the next Creation King.