Publication Information
- Ex-Aid : Zero Day
- Japanese : ゼロデイ
- Version : Kamen Rider Ex-Aid Series
- Label : The first Bugster Outbreak Incident.
- Incident : 5 years before the events of Kamen Rider Ex-Aid
- Season : Kamen Rider Ex-Aid
Zero Day is the name given to the day of the first Bugster outbreak 5 years before the events of Kamen Rider Ex-Aid, around 2011. Little is known about the details. Zero Day's outbreak was claimed to have been caused by a glitch in the 10 games Genm Corp. had in development at the time that the Bugsters' data had come from, but is later implied to have been intentional to spur an increase in the Bugster population. It is hinted that despite their use in combating the outbreak, the Proto Gashats were involved with it. The event was never made public, but it is implied many people were infected and died from the outbreak, including Hiiro Kagami's girlfriend Saki who was the host of Graphite.
One of the Bugsters born from the outbreak; Genta Uesugi, the son of a police detective aware of the incident who pursued the case through to the present; and Kiriya Kujo's friend Jungo Aihara, who seems to have killed himself or otherwise died before the infection could fully take hold. Taiga Hanaya was a Kamen Rider during Zero Day, Proto Snipe, but left CR after losing his medical license when he failed to defeat Graphite, seemingly when he was temporarily removed from being a Rider and was directed not to operate, leading to Saki's death.
Though Kuroto Dan was the real mastermind behind Zero Day, he framed his father, Masamune Dan, who was imprisoned. 5 years later, Graphite uses the Proto Drago Knight Hunter Z to spread a full-scale infections, creating a second Zero Day, even after his death at the hands of four Hunter Gamer forms of doctor Kamen Riders Ex-Aid, Brave, Snipe, and Lazer. While interrogating Masamune about Zero Day, Detective Heiji Uesugi contracted the Bugster virus, leading Emu Hojo and Asuna Karino to Masamune, who tells them the truth about Kuroto being the cause of Zero Day after discovering the Bugster virus following the Y2K incident.
It seems as if another complete Bugster, Lovelica, was born from Zero Day but remained out of the spotlight until he was needed to help prepare the final addition to Kamen Rider Chronicle. His host is unknown. It is later revealed by Kuroto that the data of all people erased by the Bugster virus, including the victims of Zero Day, is stored in the Proto Gashats. After the defeat of Masamune, Emu holds a press conference where he lists all victims of the Bugster virus and vows to find a way to revive them from their data.
The victims of Zero Day and related incidents are: Haruo Takaoka (previously unnamed, conditions and Bugster unknown), Genta Uesugi (Zero Day victim, unknown Bugster), Jiro Maki (overuse of Proto Bang Bang Shooting before Zero Day), Saki Momose (Zero Day victim to Graphite), Kiriya Kujo (killed by Kuroto for investigating too deep, later revival not revealed to the public), Sakurako Dan (victim to Poppy Pipopapo before Zero Day), Masamune Dan (former suspect, killed self to avoid punishment for Kamen Rider Chronicle incident), and Kuroto Dan (killed by Parado, later revival not revealed to the public).
Related Post : Source : wikipedia / kamenrider.wikia
