Former women's world champion Japan edged China 1-0 on Monday to make it two wins out of two at the E-1 Football Championship.
Mina Tanaka scored her second goal of the four-team East Asian tournament in the first half to settle the contest at Chiba's Fukuda Denshi Arena.
North Korea also has six points thanks to a 1-0 win over South Korea at the same venue in an earlier match and leads the standings on goal difference ahead of Japan.