Kamen Rider Zi-O 21

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Episode 21
Mirror World 2019
Kamen Rider Zi-O episode
Writer Shimoyama Kento
Director Tasaki Ryuta
Action Director Miyazaki Takeshi
Original air date February 3, 2019 (2019-02-03)
Viewership 3.1%
Forum Thread Thread
Fan Rating 4.13 / 5
Episode chronology
← Previous
Episode 20
Final Answer? 2040
Next →
Episode 22
Zi-O Strongest! 2019
Episode List
Kamen Rider Zi-O
< Ep 20 Mirror World 2019
Ep 22 >
Aired with Lupin VS Pat 50

Important things that happened


Kamen Riders

Ride Watches

Another Rider

Another Ryuga

Another Ryuga.png Another Ryuga Watch.png

Ride Watch: Another Ryuga Watch (アナザーリュウガウォッチ)
Height: 190.0cm
Weight: 90.0kg
Year: 2002
Characteristics/Powers: Comes from another world inside mirrors/Can reflect enemy attacks. (鏡の中の異世界と現実の往来/鏡で敵の攻撃をはね返す。)



  • Kido Shinji / Mirror Kido Shinji (Ryuki) - Suga Takamasa 城戸真司 / 鏡像の城戸真司 - 須賀貴匡
  • Ookubo Daisuke (Ryuki) - Tsuda Kanji 大久保大介 - 津田寛治


  • Junction
  • Häagen-Dazs Green Tea with Nakajo Ayami
  • Zi-O Blu-ray and DVD
  • Cross-Z spinoff
  • docomo Hikari with Ex-Aid
  • LVSP Junction

Song Used

Over "Quartzer"


  • When Another Ryuga uses his dragon hand, it plays the Ryuki/Ryuga fireball sound effect. Incidentally, Another Ryuga is the mirror version of Ryuki/Ryuga. His dragon is in his right hand and sword in left, whereas it's flipped for normal Ryuki/Ryuga.
  • Shinji's apartment is Room 401. On the Ryuki TV series, this is the room number of a science lab in Seimeiin University where Kanzaki Shirou and a crew of scientists conduct experiments on people transforming into Kamen Riders with Card Decks to enter Mirror World.
    • Furthermore, the apartment is covered with newspapers to prevent monsters attack from Mirror World. On Ryuki Ep 01, Shinji investigates the disappearance of Sakakibara Kouichi whose apartment is covered with newspapers for the same reason.
    • Shinji's apartment was never seen on Ryuki, but it was mentioned that his landlord kicked him out for not paying rent on time, forcing Shinji to relocate and live at a tea shop called Tea Atori.
  • In Mirror World, Sougo picks up a flyer which has a drawing of a brother and a little sister. On Ryuki, the drawing is a symbolic meaning to Kanzaki Shirou who cares for his little sister, Kanzaki Yui.

Actor Trivia


Kamen Rider Zi-O 21 Transcript

External Links