A record of observing two adulterous couples who have sex at a remote, remote hot spring inn that perfectly deals with alibi

A thorough voyeurism of a two-amate couple (both married) who visit a member-only hot spring inn that will definitely keep members' secrets in a remote countryside. The extramarital couple, who think they are not being seen, are bold and lewd and devoured pleasure with their bodies. A camera set up in a hot spring and a guest room shows a deep sex between a man and a woman who is infamous with an affair