Mitsuhide Nira of the 1st Division pays a visit that leaves an unpleasant taste in the Special Unit. Meanwhile, a Roidmude targets Hayase, Shinnosuke's former partner. When things get out of hand, Shinnosuke has no choice but to reveal his identity as Drive to the public.

Shinnosuke’s secret identity as Drive is now public knowledge. Chief Honganji, who had known this all along, purposefully leaked this information to the media, calling it a “move ahead against the enemy”. He thinks that now that Roidmude 001 has started to move, making Drive a widely known hero is a more advantageous circumstance. Also, the fact that Roidmude 001 could be involved in Shinnosuke’s father death has arisen. What kind of powers does Roidmude 001 have? Meanwhile, Chase has helped Drive once but he is still confused. What is he fighting for? What is he supposed to protect? In the middle of his thoughts, both Shinnosuke and Heart pay him a visit at the same time…

Shinnosuke and the rest of the Special Unit are now more confident thanks to the new Ride Booster support vehicles. Kiriko and Go eventually get into an argument whether to trust Chase or not as a Kamen Rider. Later, Shinnosuke joins a joint investigation from the Central Government Office where Brain (in his human form) tries to frame Shinnosuke, whom is already aware of Brain's involvement in the division. Meanwhile, a girl named Yoriko seeks Go's help as her brother was attacked by a Roidmude.

Cases of mass robbery are believed to be by a culprit who was responsible for murdering Eisuke Tomari. Shinnosuke is pumped up to solve the case alone. Meanwhile, Brain appears before Go and offers an alliance.

Due to Mach’s intervention, Shinnosuke could not apprehend the murderer of his father. Has Mach become the enemy? In addition, Shinnosuke is regretful about prioritizing his need for answers over saving lives and lets Chase know.

In contrast, Kiriko, having seen Go's betrayal, is starting to have trouble with solving the case and is getting hasty. The reason: this change in Go is no doubt the work of Roidmude 001 and this case is deeply connected to him as well. Brain is trying to get rid of anyone with any relation to the bank robbery from 12 years ago and Maruya (Negishi's former accomplice) testifies feeling something that could very well be a "thick air" event.

Meanwhile, the recovery of Protodrive's memories that Chase had requested to Kiriko is complete. An unthinkable truth was hidden there.

A young man named Toru Fujiki has asked the Special Investigation Unit for help. Toru says that his father, who runs a factory in town, has suddenly disappeared. To make matters worse, all memories of Toru's father have been erased from his family and the factory employees.

After being revived, Shinnosuke has gained a new power in the form of Type Tridoron. However, he can’t help but be worried by Freeze’s final words. Meanwhile, a Roidmude has stolen reports from a crime lab. The stolen documents were all cases that involved Shinnosuke’s father, Eisuke Tomari.

Nira put the Special Investigations Unit in siege to lure Shinnosuke into a trap. He intends, after framing Shinnosuke for the whole incident, to kill him and make it appear as if it was self-defense with the same gun that killed Shinnosuke’s father, with the other Riders fairing no worse, with Go fighting Heart wanting Banno's tablet, and Chase unable to save a poisoned Yukari with Mad Doctor.