Kagura Rentaro atau lebih dikenal Kamen Rider Shinobi, setelah berlatih cukup berat dari shinobi legendaris Hanzo, kini ia kembali ke Asakusa bersama dengan Asuka, dan akan membantunya menjadi ninja sampai hari kelulusan nanti. Selain itu dia dan Hattari akan sibuk melawan Yoma.

In the ancient time of Japan. A ninja clan named Niji no Hebi has associated themselves with the youkai to gains the power tho rules the country.Only six legendary ninja has successfully sealed them.However,in the present time, Niji no Hebi has start to uld the present generations of ninja defeat them once again? We see...

A dangerous threat draws closer to the Earth, leaving the fate of it in the hands of armored warriors and the shinobi that hides in the shadows. Will they be able to save it? Witness the power of both Kamen Rider and Shinobi!

We know there are many alternative Earths found in the Kamen Rider universe, but what if there was an Earth where Kabuto and Ninjas share the same Earth?