Urawa Reds wrapped up their first WE League championship with a round to spare Saturday following a 4-0 win over local rivals Omiya Ardija.
Hikaru Naomoto and Mei Shimada netted in the first half at Urawa Komaba Stadium, while Kiko Seike added two more after the break as the league leaders improved to 49 points, nine clear of second-place INAC Kobe Leonessa, who have two games left.
Having also won the WE League Cup in October, Reds completed the Japanese women's football double with the victory, which came on the heels of just their second defeat of the season, 2-1 to AC Nagano Parceiro last weekend.
"It hasn't really sunk in," Naomoto said of winning the championship. "We didn't perform well under high pressure in the previous round, so we wanted to take stock and show our strengths this time. I think we managed to play well."
The midfielder paid tribute to the Urawa fans who turned out to see the team clinch the title.
"Even getting on the bus today, there were a lot of supporters waving banners," she said. "It was amazing."
Reds become the second club to lift the WE League champion's trophy after Kobe, winners in the inaugural 2021-22 season of Japan's first fully professional women's football league.
Urawa won their previous women's top-flight crown in 2020, in the final season before the WE League's launch.