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.

Go turned out to be the son of Professor Banno, the inventor of the Roidmudes. This fact was not known by Kiriko, of course. Shinnosuke, now knowing the reason behind Go’s particular animosity against the Roidmudes, is left speechless.

As for the ongoing case of the residential complex victims, it is now theorized that the ultimate target could have been Go all along. Could Go’s refusal to accept Chase come not from him becoming a Kamen Rider but because of his Roidmude condition? Shinnosuke has promised Kiriko that he’ll rescue Go no matter what.

However, the disciplinary restriction Nira placed on him prevents transforming into Drive. Chase, who has appeared to prevent further problems at Shinnosuke’s request, is the target of Go’s wrath once more.