Sakurako Kujō poses as a fellow test subject to protagonist Sora during medication trials at the hospital, but this is a deception. In reality, she possesses detailed knowledge of Sora's experimental procedures. Sakurako works closely with Hiyori Kisaragi in conducting these trials, specifically acting as the liaison communicating with undisclosed sponsors or clients funding the experiments. These trials test new medicines on subjects like Sora, selected for perceived physical suitability, and offer rewards such as granting Sora authority over staff members like nurse Yuu Yagami. Sakurako's role involves actively facilitating and managing these ethically questionable medical procedures under false pretenses as the link between the hospital and the anonymous funding parties.