After her husband left behind debts and vanished, Yuuko, with no one else to turn to, visits a house by the sea belonging to her only relative, her brother-in-law. However, he refuses to even provide her with a bed or food. 'Mom will become an ama!' With no other choice, Yuuko decides to become an ama diver. After enduring countless waves, she finally becomes skilled at gathering seafood. One day... while diving in the sea, Yuuko discovers a very rare pearl.
