Takuya Yamagami is a boy who loves animals so much that he is called a pet doctor. One day, Takuya receives a long-awaited pet hamster from his zoologist father. However, when he was looking at his father's forgotten "Endangered Animal File" on his computer, the hamster bit into the computer's code, and at that moment his body turned blue and a white star-shaped pattern appeared on his forehead! Furthermore, when I touched its body, I was able to telepathically hear the animal's voice. Takuya named this mysterious hamster Blue, and took him everywhere with him.