Since her mother passed away, Mizuki has been living with just her father. Recently, due to her father's work, they moved near her grandfather's house, increasing the opportunities for the three of them to have dinner together. One day, her father said he couldn't come home because of work, so Mizuki ended up staying at her grandfather's house. Then the grandfather said, "Since it's like that, how about you take a look at my work?" and lured her into the warehouse. The innocent Mizuki entered the warehouse, and the grandfather brought out some rope...
