Sakura, a full-time housewife suffering from severe lower back pain due to household chores, finds a flyer for an inexpensive mobile massage service in the mailbox. Intrigued by the promise of results or no charge, she decides to give it a try, unaware that she's walking into a depraved masseuse's trap. What starts as treatment for her back pain gradually shifts to her groin area, leaving her feeling a growing sense of unease. By the time she realizes something's amiss, it's too late. Her underwear is drenched with an overflowing abundance of precum.