For all of Japan’s relative prosperity, this might be one of the hardest first-world nations to be a single mom. Only 20 percent of divorced fathers pay alimony, compared to about 75 percent in the U.S. Childcare facilities with more work-friendly hours have a waiting list of 21,000 children, and other daycares have frequent off-days, so women scramble for coverage. Professional women are forced to take part-time work, and see savings that are a small fraction of their married counterparts. Planning for retirement? Forget it.