Ruri, a high school student, woke up one morning to find that she had suddenly grown horns on her head! Her mother told her that she might have inherited it because her father is a dragon. Ruri's mother tells her that she might have inherited it from her father, and she is puzzled, but goes to school anyway.... Her classmates are curious about the spontaneous horn, and another dragon constitution is revealed! With a slight change in the usual routine, the daily life of Dragon Girl Ruri begins!