Tomoe is a child of the Sekiguchi family who serves the Kurokawa conglomerate and he is famously known as the "dog" of the Kurokawa's second son, Choujirou.

The two of them were quite close as children but now, Choujirou has one-sidedly put a distance between them while also terrorising him. Because of that, their schoolmates have also been keeping a distance from him but one day, a boy who doesn't seem to care about that matter at all began to approach Tomoe...?