The brief but ultimately momentous escape of Silpelit #3, who killed several Security Guards in the process, occurred sometime after Kurama first joined the Diclonius Research Institute. At the time, not much remained unknown about vectors, the Diclonius Virus and the Diclonius themselves. A young diclonius, only known as Number 3, escaped from her containment unit after hiding how her vectors had grown in the recent months. During her escape, she killed at least three DRI personnel, including a scientist and two security guards, with more possibly killed offscreen. She made her way to the office of Kurama, Oomori, and Professor Kakuzawa, where she infected the former two with the virus, unbeknownst to them, before being shot dead by the latter.