V3 saves Riderman from Sickleneck-Tortoise's nerve gas in the nick of time. Regardless Riderman doesn't want to listen to V3's words against Destron � he only seeks revenge against Marshal Armor. Meanwhile, Marshal Armor begins his plan to spread the nerve gas and begins killing innocents throughout Tokyo, and while Kazami Shiro investigates with Yuki Joji right on his tail, Sickleneck-Tortoise stalks them both�