Kei Sugiyama, a busty idol working part-time at a shop in Shinjuku. As part of a popular current campaign, customers who spend over 10,000 yen receive a special perk: "10 minutes of unrestricted access to Kei's breasts." She takes the hand of a customer claiming the reward, and the service time begins. Kei showcases her massive breasts bouncing on a large massage machine, and as the torment continues with a triple vibrator, she eventually collapses completely.