Sakura, a housewife, has been suffering from severe back pain due to the fatigue of housework. One day, her husband finds a flyer for a mobile massage in her mailbox. Sakura decides to give the massage a try, as it is cheap and advertises that if there is no effect, they won't charge her. Without realizing that it is a trap set by a despicable masseuse... The pressure points that are said to be effective for back pain start out around the waist, but gradually move towards the groin. By the time she feels something strange, it is already too late. Her underwear is overflowing with a large amount of vaginal fluid.