Kamen Rider Viper

Originally, Ryo had a grudge on Yamato due to not being having joined DESMAP like him. In the Episode 4, he uses the Viper Phone (バイパーフォン, Baipā Fon), given to him by a villain, and dials 6-0-0 and inserts it into the Viper Belt (バイパーベルト, Baipā Beruto)to transform into Kamen Rider Viper (仮面ライダーバイパー, Kamen Raidā Baipā) to fight Gekiryu. He is armed with the scimitar-like Poison Sword (ポイズンソード, Poizun Sōdo) and the Viper Axe (バイパーアックス, Baipā Akkusu). The Viper Phone later would be destroyed by Gekiryu Seiryu Form's Blue Dragon Slash.