The enthusiastic Cursed Tool collector Superintendent Gabriel calls in Haruaki, Fear and Konoha to receive a suitcase containing a Cursed Tool in the form of a doll. The suitcase is empty, so Gabriel revises his request to find it. At the same time they learn of several students in the school fainting and their life force being drained. Eventually, the trio tracks down Sovereignty, the Cursed Tool doll with blue hair and frills responsible for the situation, inside the sewing room...