Shino Mayu plays a married woman troubled by a sexless marriage with her husband. Hoping to fill the void, she visits an erotic massage parlor, only to encounter a "full course of pleasure" that will turn her life upside down. Her porcio is relentlessly stimulated, causing her body to arch backwards as she climaxes so intensely. She squirts copious amounts of fluid, loses herself in the pleasure of moaning, and becomes so addicted to the pleasure that she goes into debt to visit the parlor again and again. Unbeknownst to her husband, she is taken over by a stranger's penis, both in mind and body. This drama unfolds as a married woman sinks deep into a swamp of pleasure, unable to return.