Following the reveal of Genm’s identity as Kuroto Dan, Emu catches up to Kiriya and gets the full story of his friend who died on Zero Day: after hearing of his Bugster infection, he was so shaken up he got caught in a traffic accident, which is why Kiriya is investigating the Bugsters.At CR, Kuroto’s deception is discussed, Hinata confirming that only Kuroto was involved in all of Genm Corp., and that the Ministry of Health will handle the matter. Emu talks with Shuhei’s mother and learns that she and her husband are patissiers (cake makers) whose business around Christmas bothers Shuhei and that he broke his leg climbing a tree in a park; Emu finds and climbs the same tree, finding something on a branch. Meanwhile, Kiriya visits a prison and meets with an inmate, former Genm Corp. CEO Masamune Dan. Emu talks with Shuhei about always being alone as a kid and playing video games to occupy himself (a flashback showing a crayon sketch of a 2-player game he envisioned), and that Shuhei instead climbs trees to cope; however, Shuhei’s infection flares as the Level 3 Salty attacks his parents’ patisserie, Le Couple.Arriving with Poppy and Shuhei, Emu transforms into Ex-Aid Sports Action Gamer Level 3 using his newly acquired Shakariki Sports Gashat, Salty summoning a group of his same Bugster Virus chefs as before and Brave Beat Quest Gamer Level 3 joining the fight. Salty is knocked into a Mighty Action X block, releasing a Christmas Energy Item that turns Ex-Aid into a Santa Claus-dressed Level 1 form and decorated Sports Gamer bike as it starts snowing. Shuhei’s mother comes over to Shuhei and says Emu told her he’d climbed the tree to get at holly berries for a wreath he was making for her but fell, giving him a cake decorated with their family. As Salty attacks again, Poppy breaks open two more blocks and sends Christmas Energy Items to herself and Brave, dressing them as Santa, too; Poppy uses Brave’s DoReMiFa Beat armaments to trigger a remix of “Jingle Bells” and starts singing along. Brave and Ex-Aid keep fighting Salty as the Bugster Viruses are entranced into dancing along with Poppy; they hit Salty with a Gashacon Weapon dual B-Button attack, all of them striking a pose for the camera before the Bugsters explode into the message “Merry Christmas” for the audience. A cloud of cell Viruses are pulled into the Gashacon Bugvisor by a nearby Parado. Poppy’s singing, however, is stressing out Shuhei all over again; Poppy admits that she’s actually a Bugster herself from DoReMiFa Beat, but Emu and Hiiro respond that anyone could have figured that out. Back at their hideout, Kuroto and Parado look at their new project, the “ultimate game”: Kamen Rider Chronicle. After a Christmas party at CR, Emu mentions to Director Kagami how Salty separated from Shuhei on his own, Hiiro explaining that viruses survive vaccines by mutating, leading to Emu realizing the Bugster virus is evolving. Just then, Kiriya calls for the Riders to gather so he can tell them something, but before leaving, Taiga is stopped by a girl wearing Genm Corp. game merchandise; she introduces herself as Nico Saiba and asks him to defeat the Genius Gamer M.Kuroto arrives to meet Kiriya, revealing the prisoner Kiriya had visited to be his father; Kiriya says that Masamune told him Kuroto had met Emu 16 years ago, revealing that he knows how Emu can transform without a compatibility surgery. Kuroto offers Kiriya a new Gashat beyond the first 10 as a trade for keeping silent; Kiriya takes the Gashat but says he wants Kuroto to pay for Zero Day, transforming into Lazer Bike Gamer Level 1 and triggering the new Gashat, Dangerous Zombie, but upon putting it in the Gamer Driver, it zaps away most of his Rider Gauge health. Kuroto says Kiriya knows too much, taking back the Gashat and using the Gashacon Bugvisor with a new belt to form the Buggle Driver, transforming into Genm Zombie Gamer Level X (Level 10), summoning a swarm of Bugster Viruses dressed in torn civilian clothes and stumbling about like zombies to intercept the other Riders as they arrive outside; Lazer desperately transforms into Chambara Bike Gamer Level 3. The Riders transform to Level 2 and destroy the Bugster Viruses, but Lazer is easily overpowered by the new Genm, even Sickle Mode Giri Giri Critical Finish seeming to do nothing, before Genm steals the Gashacon Sparrow and Giri Giri Chambara Gashat, using his own Critical End finisher and depleting the last of Lazer’s Rider Gauge. Kiriya claws at him, but is pushed aside as it begins to rain. The other Riders arrive as Genm leaves, running over as Kiriya’s body begins to digitize and fade. Kiriya gives his Driver and Bakusou Bike Gashat to Emu, telling him to take his fate in his own hands. The Driver announces: “Game Over” after Kiriya dies and his body completely fades away into nothing. Emu cries holding the Gamer Driver over the place where Kiriya’s body was as the others look on in shock.Kamen Rider Ex-Aid is an absolute joy. Rarely does a Kamen Rider series so brilliantly combine its differing themes into such a perfect package, with one of the most loveable casts in recent years. This Christmas episode along with Episode 11 are great offerings from an awsome show.