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The text describes , a researcher who initiates the "Rider Battle" in an attempt to change the past and save his sister, Yui. 🔍 Key Context

: His true intent is to use the life force of the winner to give his sister a new life before her 20th birthday. 📄 "Solid Paper" Reference The text describes , a researcher who initiates

: Kanzaki Shiro is the primary antagonist and "game master" of the Mirror World. The text describes

: Shinji Kido (Kamen Rider Ryuki) constantly tries to break Shiro's cycle of violence. The text describes , a researcher who initiates

: He creates the 13 Card Decks to force Riders to fight to the death; the survivor is granted one wish.

: Is it right to sacrifice many lives for the sake of one loved one?