Horny Diver: Tight Shellfish (1985)

A small fishing village becomes the target of Mr. Matsunaga, a ruthless real estate developer who wants to turn the quaint area into a lucrative tourist attraction. Hiring a young, horny man named Junpei to bed the local ladies in an attempt to persuade them all to sign deals for their land, the lovely diving girls of the area succumb to his sexual desires. When the true intentions of the developer are discovered, the entire sleazy plan comes crashing down. Will the diving girls continue to grab their clams? Will Junpei finally find true love among the luscious naked nymphs?