The life of promising young golfer Tonbo Oi changes when she meets Kazuyoshi Igarashi, a former professional golfer who is looking for a job on the island of Kagoshima.

Tonbo Oi lost both of her parents in a car accident when she was young and was raised by her grandfather 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.