Ama dives into loincloth, slimy shellfish

Toshiyuki, his nephew, comes to a certain fishing port to visit his aunt, Yumi, who is an ama diver. Toshiyuki was worried that Yumi, who lost her husband a year ago, was not feeling well, but when she saw Yumi's naked body full of vitality after a long time, she was relieved that there was no need to worry. One day, Toshiyuki learns that Yumi is looking for a new partner. Just when Yumi is being approached one after another by the men at the port and has yet to decide on a partner, her favorite fisherman, Sasaki, asks her out on a date on the boat...