A secret infiltration into a well-known local health shop, with hidden camera footage captured. Once a bustling entertainment district, the area now lies in decay, with numerous abandoned brothels remaining along the riverbank. Yet among them, one or two establishments mysteriously remain open, operating from dusk into the night. The buildings retain their vintage appearance, and the women exude an old-fashioned charm. An undercover team sneaks into a suspicious shop in a city within a certain prefecture to investigate these retro-style brothels. Concealing an ultra-compact camera inside a bag, they discreetly record inside the premises. Of course, many of the mature women here are fully capable of providing complete satisfaction, and the overall atmosphere is truly unique.