A girl named Taiga Sabatini has lost her parents, so an organization named Flare has taken a liking into her well being. When she joins she wonders who is the real Flare or if there are other Flares to accompany her since it gets quite lonesome in the missions that they give her. Taiga is like the serial killer longed to find out who killed her family, fighting to earn her own justice. She can use magic and special kinds of knives that are given to her by her client and demon, Hei. As she meets six other powerful Flare girls on the way of her journey. Taiga learns that she has to join a Flare War to find out the deep secrets in her life that she doesn't know just yet. As she trains for the war she wonders who will be the winner and become a True Flare, will she? Taiga will have to team up with six old Flare girls who call themselves The Resistance. Six Flare girls who take no participant in the Flare Wars and only want to help Taiga along her way. As she goes on her journey to find out the mystery behind her parents death, and she might find intimate love with her client and demon Hei.