It all started with a "singing dinosaur". A few years ago, an expedition team discovered dinosaurs in an underground cavern in Iceland. They took them to a southern island for research, where the dinosaurs proliferated, probably due to the suitable climate. People later found that dinosaurs can be controlled with music, so a profession called "dinosaur tamer" was created, and a training school was born. The main characters of this story: Emily and her twin sister Angie, enrolled in the school to become dinosaur tamers...

Yumimi Yoshizawa is an ordinary high school girl. She lives an ordinary but enjoyable high school life with her childhood friends, Sakurako and Shinichi. One day, mysterious objects appear in front of Yumimi on her way to school. From this day onward, strange things begin to happen one after another...