Kayo Kitada won the women's 48-kg title while Yoshie Ueno claimed victory at 63 kg on the first day of a French international judo competition on Saturday.
In men's action, Hiroyuki Akimoto emerged the winner at 66 kg to give Japan its third victory at the two-day meet.
Kitada, who won her third straight Kodokan Cup at the national weight-class judo championships last November, beat Athens Olympic silver medalist Frederique Jossinet of France in the semifinals and then outpointed Cuban Yanet Belmuy in the final.
Tatsuaki Egusa finished runnerup in the men's 60-kg class.