Hitomi had promised her adorable Kuro that she had to depart to a distant place, but reassured him she would return soon as long as he behaved and took care of their home. Leaving behind a message of love, she set out on her journey. The story, however, did not conclude with her departure.
Fast forward a hundred years later, Mitsuko's parents went through a divorce, and her mother failed to arrive to pick her up. Luckily, her teacher selflessly volunteered to become her guardian. One day, Mitsuko and her comrades decided to explore an ancient, eerie mansion, only to be suddenly ambushed by a black dog.
Mitsuko fearfully anticipated the dog's bite, but instead, it affectionately approached her and led her to a painting of a woman who shared a striking resemblance with her. To her surprise, the dog then transformed into a nude man who tightly embraced her! What will be the fate of Mitsuko? Will Kuro, the valiant, handsome dog, win her affection, or will her dependable teacher come to her rescue?