Domestic competition featuring top competitive swimmers was held. Women's 200m individual medley was a close contest between three people aiming to qualify for the Paris Olympics.
Ohashi and Matsumoto tied for victory. Yamato Fukasawa won the men's 100m breaststroke with a new tournament record time of 59.53 seconds, achieving his second title after winning the 200m Breaststroke on the 17th. The competition was held at the Tokyo Aquatics Center in Koto Ward, Tokyo for two days.