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.