Shuichi Kagaya is a common secondary school child in a boring little community. But when a lovely classmate is caught in a stockroom fire, he finds a mysterious power: he can transform right into a hairy pet dog with an extra-large revolver and a zipper down his back. He conserves the lady's life, sharing his key with her. However she's looking for the sis that eliminated her household, and also she doesn't care just how derogatory it gets: she will make use of Shuichi to achieve her objective ...