Dress Wizard!

Shirou is a high school student and lives at a school dormitory. He enjoys his life there with Yoriko, Aoi, Haru, etc. One day, he meets a monster and a soldier girl called the Blue Empress on his way home. He gets involved in their battle and gets badly injured. When the Blue Empress tries to cure him, a bright light surrounds them and they lose consciousness. When Shirou regains his consciousness, he finds Aoi lying beside him. Shirou and Aoi come back to their dormitory and he is told that Aoi and Haru are the Dress Wizards and fight against monsters for world peace. He is also told that he has a special magic power. Several days later, a monster appears and they fight against it. "If I have a special magic power like they said, I must do it!" Haru gives him an item and Shirou finally transforms himself into the Walser...