It aired on TV Asahi from January 25, 2004 to January 23, 2005 and ran for 49 episodes.

Kazuma Kenzaki is hired by the mysterious BOARD organization to combat the Undead, a series of 52 creatures who ten thousand years ago fought between each other in what was known as the Battle Royale to determine the dominant species on the Earth. They were all sealed away by an Undead known as the Joker until archaeologists in the present day undo the seal. Kazuma Kenzaki and Sakuya Tachibana fight together as Kamen Rider Blade and Kamen Rider Garren to protect humans from Undead and seal them. Also fighting Undead is the mysterious Chalice, a Kamen Rider whose purpose is unknown. In addition, a young man struggles to free himself from the control of the sealed Undead powering his own Undead-made Rider System, fighting as Kamen Rider Leangle.