If you listen to the instrumental (here) https://pepoyo-ppy.fanbox.cc/posts/4571168, during the part where obake (VY1) dies, at about 2:48, you faintly hear the melody of pepoyo's song Chuushajou played on a music box, and obake said "Chuushajou" as she died. (Chuushajou means to "inject", obake died because she injected drugs into herself with a syringe, chuushajou is about syringes)
