Des：RUBY conducts interviews with people who love things he met on the internet! This time its the secret hot spring inn edition! The ultimate fetishism of exchanging partners. The forbidden feast of 4 groups of 16 couples, all high-class perverts seeking high-level pleasure, is filmed using a fixed camera. Complete recording of all the details of the live swap! We present you a real swap where you offer your beloved partner to someone else and have sex with each other in front of your beloved partner.