The Bugster Poppy Pipopapo had already emerged by the time of Zero Day, having been born from the Bugster Virus infection of Kuroto Dan's mother, Sakurako Dan, her host's life was sacrificed in the process as she succumbed to the Game Disease, thus completing Poppy's existence as a Bugster, and Kuroto also regretting having lost his mother.Finding that the Bugster Virus had been discovered by radiologists Taiga Hanaya and Jiro Maki, Asuna relayed this to Kuroto Dan.
Two weeks later, Asuna alerted Taiga to the case of a Bugster-infected patient whom he had treated before, Sasami Hishinuma.
Proceeding to CR, the pair found Maki with a Gamer Driver and the Proto Bang Bang Shooting Gashat, intending to become Snipe in Taiga's place.
As a Bugster, Poppy's origin is traced to the Y2K bug, which left what would be known as the Bugster Virus on the younger Dan's computer shortly following New Year's 2000.
Secretly incubating the virus by infecting the young Emu Hojo with it, Kuroto Dan would arrange for its matured form to be extracted by Michihiko Zaizen ten years later, using it to execute the Zero Day incident in the following year.
Poppy Pipopapo later finds the inert Collabos Bugster which she is unable to budge, projecting a blank Game Area which soon enough manifests as Ganbarizing, causing it to come back to life and go berserk before Ex-Aid arrives, allowing Poppy to get away.