The lower averaging one is the female one, but one must remember that japan is deeply conservative and that means household and caring for kids/elders are womens duties - additional to the working hours. I couldn’t find data for the amount of unpaid work done, but i found participation surveys, which show the difference in what percentage of men/women are involved in unpaid work on any given day in the working populace:
hxt9ONT8LblsHvG.png

source: https://www.e-stat.go.jp/en/stat-search/files?stat_infid=000032224111