There are two races who have co-existed in this world for hundreds of years: the ‘mahoroi’ who have animal ears, wings and tails, and the humans who don’t. The maple-adorned town of Tsugumomi, located at the base of a mountain, is said to be the origin of the mahoroi. This is where Seiji encountered a mahoroi girl in a scene much like those in countless stories from the past. “… I finally met you…!” She looked at him with misty eyes and flushed cheeks, parted her lips and did her best to convey her hidden feelings. “Um, um. My… no, I…” Yes, this is the beginning of a traditional love story… “I… am master’s pet♪” NOT!! Rather than a love confession, she proclaimed to be his pet! The relations between the mahoroi and humans were shaken by this girl Momiji’s appearance, but above all, Seiji’s surroundings changed drastically after the self-proclaimed pet’s intrusion. It’s a new page in the storied history between the two races. What will happen from now on?