This article is about a/an character in the film Shin Kamen Rider: Prologue.

Shiin Kazamatsuri (風祭 新 Kazamatsuri Shiin) (aka.Rider Baby), also named Kamen Rider Shin (仮面ライダーシン Kamen Raidā Shin), is the son of Shin Kazamatsuri and Ai Asuka in the Japanese tokusatsu movie Shin Kamen Rider: Prologue. His Rider form only appeared in the Kamen Rider Shin SIC Hero Saga.



When his parents are being chased by the Foundation as he was a baby, he uses his super ability to help them escape.Shin Kamen Rider: Prologue

SIC Hero Saga

After several decades, Shiin began to investigate the Foundation by himself. The CIA called him "Masked Rider" as his code name. He found a destroyed Cyclone with a battle suit under a bridge after an accident and he decided to put them on and called himself "Kamen Rider Shin".Kamen Rider Shin: The End of the Beginning, The Beginning of the End


  • Following his father's name literally means "True", Shiin's name is "New" as he is the direct successor of the title Kamen Rider Shin.
  • Shiin's rider form is homage to Kamen Rider 1.
  • If his S.I.C. Hero Saga story is canon, Shiin is the youngest Kamen Rider ever and no one could break the record because he was a Rider since he was a fetus.