While Manabi may be trying to make light from closures of schools, the problem is pretty dire, according to Washington Post:

Japan, now the world's second-largest economy, will lose 70 percent of its workforce by 2050 and economic growth will slow to zero, according to a report this year by the nonprofit Japan Center for Economic Research.

Population shrinkage began three years ago and is gathering pace. Within 50 years, the population, now 127 million, will fall by a third, the government projects. Within a century, two-thirds of the population will be gone.

Enjoy your anime while you can.