1971, Late night in Tokyo. When the monsters of the Shuka organization were rampaging on the streets, two whirlwind green figures cut through the darkness - those were Kamen Rider No. 1 And No. 2. In the collapsed alleyway not far away, 0 exotic wanderer Youmu Sa just fell from the turbulence of time and space. He witnessed the fight between Hongo Takeo and Ichimonji Hayato as they shouldered the fate of transforming human beings, and for the first time he saw the chivalry spirit of "for the freedom of mankind, even if it is an inhuman body, we must fight to the end." The first impression this planet gave him was not just a fragile civilization, but an unyielding light shining in the darkness.
