Kagaya Shuuichi is an ordinary high school student in a boring small town. However, when a classmate is caught in a fire in a warehouse, he discovers he has a mysterious power. He can transform into a furry dog with a large gun on his back. By sharing his secret with her, he saves the girl's life. However, she is searching for the girl who killed the Kurea family and wants to use Shuuichi for this task, regardless of how humiliating it may be.
