Followed by the revelation of his secret identity as Drive, he quickly evaded a group of reporters. He met Nira, whom told him to be cautious of himself to ensure from being suffered by the similar fate his father had. In the Special Investigation Unit, they were joined by Drive Driver, Shift Cars, Signal Bikes and Trailer-Hou. Mr. Belt trusted Jun's tactic of revealing Drive identity, having that a new shadow had appeared, as well as the Global Freeze incident. Police forces had not much awareness of the Roidmudes, meaning that some of them had infiltrated them and worse, the mystery of Eisuke Tomari might be related as well. Kiriko revealed that Chase is still alive and counted him as the third Kamen Rider. While Rinna had finished create a new system based on Mashin Chaser's Violet Guard, Go is not happy about this news, yet distrusting him as their ally.
Shinnosuke, Kiriko and Mr. Belt tried to persuade Chase to return to them, with Heart came along with the same intention on him while bringing the Shift Speed Prototype. Roidmude 001 thanked Medic for healing 007 and revealing that his involvement was due to Brain, calling him when he at wit's end due to being bested by Medic. Heart confirmed 001 as the creator of Neo Viral Cores, later hinting the latter has something related to Shinnosuke. Shinnosuke transformed into Drive Type Dead Heat and tried to force him into confessing more secrets, so much that he turn a blind eye 007's rampaging spree in search for Hajime Taga. Eventually, Chase is forced to attacked Drive, injuring his right arm in the process. Heart eventually sees Chase truly torn between the loyalty to his race or the humanity. Heart gives him back his original Shift Car while leaving to have Chase decide his own path.
Nira revealed that he had hidden Hajime somewhere else but refused to tell him the current location, as well as cheerfully criticizing Shinnosuke's inability to respond to 007's appearance. Go, Kiriko and Genpachiro leaves while Jun and Mr. Belt cheered him up, stating that they will investigate 001 along with Eisuke Tomari's death, which had been left mysterious for a long time. Rinna quickly finished the device Kiriko wanted her to make and send it to Chase via his Ride Chaser.
After finding Hajime, 007 bonded with him again as they take on the police forces.Once done, he began assaulting the officers that tried to hide him from 007, with Shinnosuke arriving to save Nira from being vivisected by Sword. However, since his left arm was broken by Mashin Chaser, Shinnosuke was unable to even insert the Shift Speed Car into the Shift Brace, making Deadheat Mach appear to save him. After a brief fight, Sword knocked Mach out of transformation, making Kiriko be the one to face against Sword, but her kicks didn't manage to hurt Sword, and in response, Sword sliced off Kiriko's Shift Car Holder and pushed her off the bridge. Now caught in Sword's Heavy Acceleration field, Shinnosuke and Go were helpless to see Kiriko fall to her doom as Sword walked right below her with an arm blade raised.
However, Chase arrived at the nick of time, beating Sword out of his spot by slamming the Ride Chaser into him and grabbed Kiriko before she could complete her fall after Sword's Heavy Acceleration field was involuntarily turned off. Chase soon suited up as Kamen Rider Chaser and began delivering Sword a royal beatdown, taking their fight outside. When Chase summoned the Shingou-Ax, he damaged Sword to the point where Chaser yanked Taga out of the Roidmude, forcibly devolving Sword back into 007. When he activated the Full Throttle on the weapon, Chaser was stopped by the weapon's peculiar charging method, though made due with shooting a recovering 007 back into place, allowing Chaser to destroy 007, giving Chaser his first Roidmude kill. Heart sees the battle from afar and bitterly accepted the path Chase had chosen.
While Chase wandering on the streets, the news of his appearance as Kamen Rider Chaser quickly stormed the media while he doubted that if he had chosen the right path. While Nira ensures to his superior, Soichi Makage to keep an eye on the Special Investigation Unit and Shinnosuke, Brain (in his human form) congratulated Soichi for his help. Soichi tell him that they will succeed, as the world still has it's supply of bad people and reveal himself as Roidmude 001.
- Big Damn Heroes: Just as Sword was about to impale Kiriko, Chase came in crashing, kicking his bike right into the hybrid and catching Kiriko in his arms.
- Conflicting Loyalty: The main gist of Chase's arc - he can't decide between helping humanity or his friendship with Heart. In the end, he chooses humanity.
- Handicapped Badass: Shinnosuke gets his right arm broken by Chase. This doesn't stop him from trying to prevent the reunion of 007 with Taga.
- Jerkass Has a Point: Shinnosuke himself notes that Nira had every right to berate him for not coming to stop 007.
- The Man in the Mirror Talks Back: 001 communicates with Medic this way, taking the place of her reflection, even managing to pull of a small Mirror Routine.
- My God, What Have I Done?: Chase is hit by this when he accidentally breaks Shinnosuke arm to save Heart.
- The Mirror Shows Your True Self: While looking into a stream of water, Chase's reflection appears as his Roidmude form.
- Redemption in the Rain: When Chase saves Kiriko and then goes to transform into Kamen Rider Chaser, a stream of water from a pipe cut by Sword falls on him.
- The Worf Barrage: Sword Roidmude lays his Sword Beam attacks on Kamen Rider Chaser, but he ain't even budging.
- The Roidmude Count: 66The Answer: He's returning to his role as a protector of humanity under the name of Kamen Rider Chaser.
