Kamen Rider Blade

Kamen Rider Blade ("Masked Rider ♠ (Blade)"), is a Japanese television series. 
Production.
It is the fourteenth installment in the Kamen Rider Series. It aired on TV Asahi from January 25, 2004 to January 23, 2005. It is a joint collaboration between Ishimori Productions and Toei. Along with the standard insect motif of the Kamen Rider Series, "Kamen Rider Blade" also uses a Playing card motif. Each Rider is assigned one of the suits from a deck of cards. It aired as a part of TV Asahi's Super Hero Time block with "Tokusou Sentai Dekaranger".
DVDs.
"Blade" was later released on DVD by Toei. There were twelve volumes released with the first eleven having four episodes per DVD and the twelfth with five episodes.
Story.
Ancient battle.
Ten thousand years ago, a large battle known as the Battle Royal was fought by fifty-two Undead. Each side represented a species fighting for dominance. The winner was the Human Undead, known as Category Two of Hearts, giving dominion of the Earth to humanity. 
New Battle Royal.
In the present day, archaeologists discover the sealed Undead. But unfortunately, they accidentally set them free. Thus, a new Battle Royal begins.
Rider system.
Having developed the Rider System, based on the Joker's ability to copy sealed Undead, the organization BOARD (Board of Archaeologists Research Department) equips two young men, who become Kamen Riders: Kazuma Kenzaki and 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 Hajime Aikawa as Kamen Rider Chalice, whose purpose is unknown. In addition, young Mutsuji Kamijo fights to free himself from the control of the sealed Undead powering his own Undead-made Rider System. He fights as Kamen Rider Leangle.