A man decides to install hidden cameras at a J-style massage parlor after seeing rumors about an underground option on their message board. He invites two girls, E-cup Natsuki-chan (newbie) and B-cup Haru-chan (virgin), both working there secretly without telling their boyfriends. During the massage session, he tries to negotiate for some extra services but ends up forcing himself onto them anyway. In the end, they all have sex including creampies and cumshots.