光翼战姬～ExS-TiA协奏曲１～

In an ordinarily peaceful town plagued by disasters, the heroine Haruna becomes involved for reasons seemingly unknown. But in reality, she is a transforming messenger of justice on a mission to eliminate the root cause of the crisis.

In the peaceful city of Kawado Higashi, an ordinary girl named Haruna walks along the road as usual. The frequent number of accidents in the area, though serious, hadn't worried Haruna too much. However, when she hears her classmates talking about an attack on the street, Haruna begins to fear that she may soon become involved herself...