- Written by Yuya TakahashiDirected by Satoshi Morota
Poppy and Emu are reeling from the revelations about Zero Day and Kamen Rider Chronicle. Meanwhile, Hiiro gets Kiriya's personal items from his coworker Yoshitaka Nishiwaki to see everything he may have found; Yoshitaka still isn't told of Kiriya's death. On Kiriya's laptop, Hiiro finds a file on DNA reprogramming. At his hideout, Kuroto only needs to collect data from three more Bugsters, but agents from the Ministry of Health enter and begin searching and confiscating everything; before they can take him, he shows signs of the game illness. The Riders respond to an emergency call, Emu and Asuna arriving to find the Charlie Bugster from Shakariki Sports running rampant on a bicycle around the Ministry of Health personnel at a skate park, Emu transforming into Ex-Aid Double Action Gamer Level XX. Hiiro, Taiga, and Parado arrive and transform to Brave Quest Gamer Level 2, Snipe Simulation Gamer Level 50, and Para-DX Puzzle Gamer Level 50 and begin fighting. Unable to keep up with Charlie, Level XX Orange sends Blue to distract him on the Sports Gamer with an Instigate Energy Item; Orange nabs a Muscular Energy Item, and as Blue leads him by, hits Charlie with the Gashacon Key Slasher. Charlie pulls back inside, revealing the patient to be Kuroto; with Brave and Snipe distracted by this, Para-DX leaves, knowing they've given up fighting him. Kuroto says he doesn't know how he got infected, but as the Ministry of Health personnel attempt to take him away, Emu says he's a patient of CR first and foremost, Hiiro backing him up by saying that they couldn't handle his infection breaking out again; the personnel leave Kuroto in CR's care, Kuroto whimpering thanks to Emu.
In CR, Asuna berates Kuroto before Emu stops her. His plan ruined, Kuroto tells all: in 2000, he was working in game development at Genm Corp. under his father, designing a host of games (which would later become used for the Gashats) he was convinced were the best; however, he received a letter from a young Emu containing ideas for games even better than his, the realization he wasn't the best beginning to drive him mad. At the modern Genm Corp., Taiga and Nico are presented with a blank silver double Gashat by Tsukuru, to be used for a game of a monk fighting zombies; the entire room collapses and takes a second to recover from the announcement, the pair less than impressed. Hiiro arrives with Kiriya's laptop, wanting to add its data to the Gashat. Kuroto planned to use the Bugster virus to make the ultimate game, sending a demo of Mighty Action C to Emu containing the virus, infecting him as the first Bugster patient. Hiiro explains the data's reprogramming method of treatment: it can directly alter the Bugster virus infecting a patient. At that moment, a swarm of zombie Bugster Viruses attack Genm Corp., Taiga giving Hiiro the Gashat Gear Dual β to use, Nico secretly observing that he's trying to keep Hiiro away from the risky new Gashat; the data's upload is at 58%.
Falling out of the patient bed, Kuroto continues with how he sent Michihiko Zaizen to extract the matured virus from Emu six years ago; Bugster eyes glowing red, Emu sits in anger listening to how all of the Bugster viruses came from his original infection. Kuroto accepts if Emu wants to let him die, but Emu's eyes stop glowing and he lifts Kuroto back to the bed, as a doctor can't hold grudges against their patient. Kuroto's infection flares, and Emu says he still has to atone as he transforms into Ex-Aid Level XX and Stage Selects them to a pier, fighting Charlie again. Hiiro takes Brave Fantasy Gamer Level 50, fighting the zombie Viruses; data upload 91%. Genm Zombie Gamer Level X suddenly attacks Brave; data upload complete. Outside, Brave keeps fighting Genm, but Genm is acting more like a ragdoll than normal; Snipe exits as Shooting Gamer Level 2 and switches to the new Gashat, but opening the Gamer Driver does nothing but play an error sound. He tries again, but it knocks him out of his transformation. Ex-Aid keeps fighting Charlie, defeating him with Mighty Double Critical Strike, this time not involving retaking Level X; immediately after being freed, Kuroto absorbs Charlie's debris with the Gashacon Bugvisor. He reveals that he'd infected himself using the Bugvisor when the Ministry raided his hideout, and everything after that had been an act, CR only being a place to hide and buy time; Emu is the easiest person to fool. Cackling madly, he transforms into Genm Level X, attacking and overpowering Orange and Blue; he triggers Critical Dead, summoning a horde of Genm Level X's instead of shadow zombies, duplication a standard zombie power, the attack corrupting Emu's Gamer Driver and rendering it unusable. He has crushed the glowing crystal of Emu's heart after foolishly being trusted; for his help, Emu can live.
As Brave keeps fighting the other Genm, Level 50 takes its toll and knocks him out of his transformation. The real Kuroto arrives and the other Genm absorbs into him; Kuroto leads the zombie Viruses up to his office where he retakes his chair, looking at his incomplete Kamen Rider Chronicle Gashat as purple smoke drifts from the building's upper windows. Genm Corp. is his again.
This Episode contains the following Tropes:
- Adult Fear: A lunatic targets your kid without any sort of way of knowing who he is, sends him a seemingly innocuous gift containing a deadly health hazard, and when it seems everyone's forgotten about the possibility, kidnaps him after he falls unconscious in the street. Emu's parents must've had it rough.
- Author Appeal: In-Universe. Tsukuru seems to like monks, given his ideas for a game about killing an immortal zombie involved monks for no possible reason other than this.
- Downer Ending: Kuroto not only manages to evade being arrested and continue his plans unimpeded, but also isolates Emu so that he could corrupt Emu's Gamer Driver. The ONLY thing that keeps the ending from being a complete downer is that Emu has another Gamer Driver (which originally belongs to Kiriya) in standby for the next episode.
- Evil Is Petty: Remember how child Emu was drawing the two characters for Mighty Brothers XX back in Episode 12? Emu sent a fan letter with the ideas for Mighty Brothers XX to Genm Corp., which Kuroto received. Kuroto was furious that someone other than him was also talented enough to create ideas for a game and sent him a demo game that was infected with the Bugster Virus.
- Evil Makeover: Not that he was any less evil beforehand, but once he's seemingly gotten on top of everyone else, Kuroto gets a little makeover. When he appears at Genm Corp. at the end of the episode, he struts in with a new black suit and slicked back hair.
- Foreshadowing: Of not only the Maximum Mighty X Gashat that will debut next episode, but the Gashat Kuroto will use for Kamen Rider Chronicle.
- Gratuitous English: How the Charlie Bugster talks.
- Negated Moment of Awesome: Taiga tries using the new Gashat with Kiriya's data, which then not only fails but also forces Taiga out of his transformation.
- Screw This, I'm Outta Here!: As soon as Parado sees Kuroto as the host of the Charlie Bugster, he loses interest in fighting and leaves.
- Self-Duplication: One of Genm Level X's new powers. He can either weaponize this as a Doppelgänger Attack or create a zombie clone that is just as strong as himself.
- What Were You Thinking?: The entire room's response to Tsukuru's game idea, Monk of Terror.
- Wounded Gazelle Gambit: Did you really believe Kuroto meant any one of his words in this episodes? Aside from The Reveal.
- Xanatos Gambit: Kuroto injected himself with the Bugster virus because he knew Emu and Hiiro would focus more on getting him better. He also used his villainous motivation as a sob story just so he could manipulate Emu to sympathize with him. Oh, and he used the CR as a hideout while his Bugster forces take over Gemn Corp.Gashat Count: Ex-Aid: 5 (Continue?) Brave: 3 Snipe: 2 Genm: 7 Para-DX: 1Remaining Boss Bugsters for Kamen Rider Chronicle: 2