Oribe Mafuyu is a 17 years old girl that lives a normal live with her step-sister Tomo, but this so called normal life will change once they meet a 12 year old russian boy.
Alexander Nicholaevici Herr or Sasha is known as the Qwaser of Iron who can control iron and object made of iron. Even if their ages are very different, Mafuyu fells in love with him without regrets.
Step after step they come to know each other better and become closer untile they cant control their fellings.