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: Volume 1)

Kasai Chousakan Nanase had four volumes published in English as Fire Investigator Nanase by CMX Manga from February 3, 2009 to May 11, 2010 before the publisher went defunct. Volume 5 was slated to be published on August 24, 2010.