Ruri Aoki is a completely average high school student—until one day, she wakes up with horns. Puzzled by the sudden change, Ruri asks her mother for an explanation and learns a startling fact: she is actually a half-dragon. Despite her anxiety, Ruri goes to school, hoping her new look won't draw attention. Unfortunately, her classmates spot the horns right away and crowd her with questions. On top of that, this new identity comes with a hazardous ability to shoot fireballs. To help Ruri control her powers, her mother takes her to the forest where Ruri's dragon father lives, hoping he can figure out how to stop the problem before anyone gets hurt.