Fire Investigator Nanase

Firefighter academy student Nanase is a promising rookie fire investigator, still haunted by her parents' fiery death. Three years ago, she saved a man from a burning building; he turned out to be the arsonist responsible for the death of her parents. Now this serial fire-starter has started helping her solve fire-related crimes. Can Nanase reconcile his willingness to help her with his role in her personal tragedy?
(Source: Vol.1 blurb).