Toshiyuki visits the fishing port to see his aunt Yumi, an ama diver. Worried that she might still be depressed after losing her husband a year ago, he's relieved to see her looking lively and radiant upon their reunion. However, he soon discovers that Yumi is searching for a new partner. Though she's been receiving constant advances from the local fishermen, she hasn't been able to choose anyone. Then, she receives an invitation from Sasaki, the fisherman she truly likes, for a romantic date on his boat. The story unfolds her captivating charm and the exciting possibility of a new love.