Ren had seen Ryuga attack Kamen Rider Femme while out fighting a Hydragoon, and thought Shinji had come to understand the meaning of the Rider War. He could survive indefinitely in his own universe without any extra protection, but could only stay in the real world for a short time before he started to disintegrate. The Mirror World counterpart of Shinji Kido, he would adopt the identity of Kamen Rider Ryuga and join the Rider battle in order to pursue his goal of becoming a real person in the real world. History Kamen Rider Ryuki: EPISODE FINAL 3.2.2 Transform! Ryuki is a Changing Cut!!.3.2.1 That One! Jiro Okamoto: Final Blow Diet!!.3.2 Kamen Rider Decade: All Riders Super Spin-off.2.5 Kamen Rider Heisei Generations Forever.
2.3 OOO, Den-O, All Riders: Let's Go Kamen Riders.2.2 Episode Yellow: Treasure de End Pirates.
