Yuriko was waiting for a package from Sato, a divorced single man who lives next door. She had visited him for several days, but he was too busy to be there. Today, Yuriko was finally able to deliver the package to him. It seemed Sato was also waiting for the package, so Yuriko was relieved, but she was very curious about what it was. When she asked Sato what it was, he simply replied, "It's nothing special," which made Yuriko even more curious. With no other choice, Sato showed her the contents, and it turned out to be an adult toy, a masturbator. Seeing the obscenely shaped masturbator for the first time, Yuriko became curious about how men used it...