The Qwaser of Stigmata

Tomo Yamanobe's father, the former headmaster of Saint Mikhailov Academy, disappeared leaving behind only the "icon," a piece of art. Shortly after, a series of mysterious attacks on female students started occurring. Tomo and her sister Mafuyu Oribe encountered a silver-haired boy with an iron-controlling ability who later disappeared, only to reappear and rescue Mafuyu from a magnesium-controlling attacker. Mafuyu soon discovered that the boy, Sasha, is a "qwaser" who receives elemental powers through "soma," a phenomenon associated with breastfeeding.