Over the course of the past several weeks, YoRHa Unit 9S has conducted research into both the Plume of Dusk and human behavior. Through various visits to LeBlanc, Unit 9S has encountered a great number of individuals from various time periods. Furthermore, Unit 9S's visit to a location known as Mementos has allowed him to gather more data about the Persona ability, as well as the beings known as shadows. Four Days Ago, Unit 9S received an update from Command informing him that not only had they installed a YoRHa Unit with a Plume of Dusk, but said unit had also died. No other information was distributed by Command, leading Unit 9S to believe that a Type E Unit was sent to kill the Unit with the Plume of Dusk. Mitsuru Kirijo has since offered Unit 9S support, as her company is responsible for the creation of androids known as Anti-Shadow Weapons.