One day, a courier arrived at Kobayashi's house. There are sex toys that I don't remember ordering. When I checked the address, the name was Lina, the wife of a friend and a couple living next door. Kobayashi had never seen Lina with nasty eyes, but her delusions swelled. Kobayashi visits the Ayana family. Lina, who doesn't know what's going to happen, welcomes the hungry beast with the same smile as usual ...