The group is then joined by Nico Saiba, Emu's gaming rival known as 'N' who becomes Taiga's assistant. Kuroto reveals that he infected Emu with the Bugster virus years ago, making him patient zero of the current Bugster infection.

Revealing himself to be the creator of the Bugsters after deleting Kiriya, Kuroto has been using them and the Doctor Riders to create 'The Ultimate Game', an AR MMO called 'Kamen Rider Chronicle', where everyone is given the power to become a Kamen Rider known as a Ride-Player in a fight for survival. Assisted by Poppy Pipopapo, a Bugster who joined their side under the name Asuna Karino, the four also face the opposition of the prototype Ex-Aid Kamen Rider Genm, eventually revealed to be Genm Corp's CEO Kuroto Dan. But Ex-Aid learns of other doctors who are also Riders besides himself: elite surgeon Hiiro Kagami/Kamen Rider Brave, the unlicensed 'dark doctor' Taiga Hanaya/Kamen Rider Snipe, and coroner Kiriya Kujo/Kamen Rider Lazer, who can transform into a motorcycle form. One of the chosen doctors is Emu himself, who transforms into Kamen Rider Ex-Aid to save his patients from the Bugster viruses.

Genm Corp counters the Bugster threat by developing the Gamer Driver belts and a series of transformation and summon type trinkets, the Rider Gashats, for doctors who underwent a special procedure to be allowed to use its powers. Once a Bugster fully manifests, the human host gradually fades away as a consequence of stress experienced by the host. Led by the mysterious Parad and his partner Graphite, the Bugsters manifest themselves in the physical world by infecting humans that play Genm Corp's video games at a cellular level. for short has become aware of the existence of the Bugsters, a form of computer virus that spawns from their company's software bugs. Recently, a video game company known as the Genm Corporation, or Genm Corp.

Kyotaro also gave him a WonderSwan handheld video game console as a reward that ignited Emu's interest in video games. Emu was inspired to practice medicine after a doctor, the future minister of health Kyotaro Hinata saved his life from an illness when he was a child.

Main article: List of Kamen Rider Ex-Aid charactersĮmu Hojo is an intern in the Pediatrics Department at Seito University Hospital and a genius video gamer who goes by the alias 'M'.

Kamen rider ex aid flash belt