Since her mother passed away, Miyuki has been living with her father. Recently, because of her father's job, they moved closer to her grandfather's house, and the three of them ate together more and more often. One day, Miyuki had to stay at her grandfather's house because it was inconvenient for her father to come home from work. Grandpa invited her to the warehouse, saying, "Since you're here, why don't you stop by and take a look at my work?" Mizuki innocently went into the warehouse...