After Tomo Yamanobe's father, the former headmaster of Saint Mikhailov Academy, disappeared, all that was left was an artwork called "icon." Soon after, there were rumors of a serial killer targeting female students. When Tomo and her sister Mafuyu Oribe were walking home after being bullied at school, Tomo discovered a wounded silver-haired boy who vanished when they tended to him. When Mafuyu searched for him, she found the church with the icon on fire. While she tried to save the painting, a mysterious killer who could control magnesium attacked her. Out of nowhere, the silver-haired boy, who could command iron, appeared and rescued Mafuyu from the attack. Mafuyu discovered that the boy's name was Alexander Nikolaevich "Sasha" Hell. He was a "qwaser," with the ability to manipulate elements through the power of "soma," which he obtained through breastfeeding. Despite her confusion, Mafuyu's life took another turn when Sasha joined her class the next day. With other qwasers posing a threat to their safety, what will happen to Tomo and Mafuyu's everyday school routine?