In the women's golf domestic tour tournament, the first round was held in Hokkaido, and Kana Migashima, who is aiming for the first victory of the tour, took the lead with 5 unders.
Mikajima, who finished second in the previous week's tournament, played well with seven birdies and two bogies.
Minami Katsu and Kumiko Kaneda are in second place with a one-stroke difference, and two Korean players, John Mi-jung and Bae Hig-young, are lined up.
Mone Inami, who won the silver medal at the Tokyo Olympics, finished 6th with 3 unders, 2 strokes behind the lead, and Sakura Kogure, who aims to win the championship for 3 consecutive weeks, started 24th with 1 under.