Synopsis

Upon entering the realm of Kiva, Tsukasa and his companions find that a fragile peace exists between the Fangires and humanity. This tranquility shatters when Tsukasa witnesses a Lion Fangire attacking a young woman, prompting his transformation into Decade to intervene. Observing this conflict, Wataru, the King of the Fangire, assumes the mantle of Kamen Rider Kiva, deploying his Arms Monsters to engage Decade. Forced to meet this power, Decade channels the might of Kamen Rider Kuuga, shifting