Nipponica

As of the end of 2023, there were a record 3.41 million foreign nationals living in Japan, up 330,000 from the previous year. Not only have these residents helped make up for labor shortages in the country, they also are becoming important supporters of the nation's pension system.

A good article spelling out the need for steady (and increasing) flows of foreign workers into the Japanese economy to sustain existing systems. Immigration is the answer.