Ruri Aoki is just another average high school student—until she wakes one morning to discover horns growing out of her head. Confused and unimpressed by the change, she shows them to her mother. However, her mother remains unfazed and reveals a shocking truth: Ruri is half-dragon! Although Ruri has no idea what to make of this sudden development, she decides to go to school like normal, hoping that another ordinary day awaits her. But it does not take long before her best friend, classmates, and homeroom teacher all notice something amiss. Swarmed by people requesting to look at, feel, and take selfies with her horns, Ruri realizes being a half-dragon is going to be much more chaotic than she expected.