apabila semua rider berlawan...

adakah anda peminat kamen rider?
di zaman kita kanak-kanak, kita akan terkejar-kejar akan siri ini,
KAMEN RIDER BLACK...
tetapi, menjelang dewasa ini, sudah ramai yang kurang berminat untuk menonton lagi...
bg yang berminat, tahun 2009, satu lagi kamen rider telah wujud...

KAMEN RIDER DECADE...

Meeting all the Riders, and fighting them!?

That is Decade's fate...

Kuuga's world, Kiva's world, Den-O's world...
The Kamen Rider worldsthat used to exist in
parallel to each other has begun to merge. The world
is thrown into chaos, and enemies from each of the
worlds begin appearing simultaneously.

At this rate all the worlds will be destroyed.

Kadoya Tsukasa-tachi's mission is to save the world...
by leaving on a journey to the 9 other worlds.

What is the real goal behind this journey?

How can the world be saved?

Only one thing is known... Decade may be a being that
will destroy all the other Riders.

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