RUBY assaults and interviews people who like things they met on the Internet! This time, it's a secret hot spring inn! The ultimate fetishism of exchanging partners with each other. A forbidden banquet woven by 4 pairs of 16 couples who seek high-level pleasure is visualized with a fixed-point camera. Complete recording of the whole story of raw swap! Offering your beloved partner to others, lewd in front of your beloved partner ... We will deliver the swap as it is.