Kazuyoshi Igarashi, a former professional golfer, relocates to Hinoshima Island to start a new chapter in his life, taking a position at the local development center. Expecting a quiet, rural setting, he is surprised to find a fully functional golf course built by the islanders, which turns the coastline into a shared golfing space. His amazement grows when he meets Tonbo Ooi, a young girl who plays exclusively with a challenging 3-iron club. Through his interactions with Tonbo and witnessing her remarkable abilities, Kazuyoshi rediscovers a renewed appreciation for golf and finds the true joy of the sport once again.
