Having lost her parents at a young age, Hotaru was raised by her uncle who runs an inn, and over the years they developed a relationship like that of a real father and daughter. However, on the day Hotaru turned 18, her uncle summoned her to a storehouse that she had been forbidden to enter until then. "I have been waiting for this day for so long. This is the day I will have you..." Her uncle suddenly attacked her, and had always wanted to train her. Moreover, he saw the image of her dead mother in Hotaru, and was trying to fulfill a long-held desire...