Amagi Nao

When Nao and his childhood friend Mai were attacked by monsters as children Mai became Magical Girl Arty Cherry. To this day she still protects Nao as Arty Cherry. When Cherry and Arty Rain were about to be overwhelmed by Knight Ignis Nao begged to become a magical warrior to protect his friends thus turning him into magical girl Arty Flare. Once the battle was over his senior Kotetsu helps him understand magic so he can turn back into a boy.

When monsters attack he once again turns into magical girl Arty Flare to protect his friends but every time he does it becomes more and more difficult to turn back into a boy again. Can he protect his friends and not become a girl forever?