Tonbo Ooi, the protagonist, lost both parents in a car accident at a young age and was raised by her grandfather, Gonji Ooi, a fisherman on the island of Kagoshima in the Tokara Islands. Tonbo learns to play golf using her father's inherited No. 3 iron on the island's three golf courses, which were constructed 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.