Tonbo Ooi, the protagonist, lost both of her parents in a car accident when she was young and was raised by her grandfather, Gonji Ooi, a fisherman on the island of Kagoshima in the Tokara Islands. Tonbo learns to play golf while using her father's inherited No. 3 iron on the island's three golf courses, which were built by the islanders themselves. The story begins with Tonbo meeting Kazuyoshi Igarashi, a former professional golfer who has come to Kagoshima in search of work.

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