Sakura, a full-time housewife, has recently been suffering from severe back pain due to fatigue from housework. One day, her husband finds a flyer for a mobile massage service in her mailbox. Sakura decides to give the service a try, as it is cheap and advertises that if there is no effect, they won't charge her. However, she is unaware 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 her waist, but gradually move towards her groin. By the time she feels something strange, it is already too late. Her underwear is already overflowing with a huge amount of vaginal fluid.