Thirteen girls, each with the ability to materialize "Elements" and summon metallic guardians called "Childs" have been brought to Fuuka Academy to battle mysterious creatures called Orphans. Each with a different personality and background, they must decide who they truly care about and why they fight. Thirteen girls, each with the ability to materialize "Elements" and summon metallic guardians called "Childs" have been brought to Fuuka Academy to battle mysterious creatures called Orphans. Each with a different personality and background, they must decide who they truly care about and why they fight.