Not enough space for a blanket of wind/solar ?
Japan will divert more of its energy resources to its remaining industries. It will be the average Japanese who will suffer. Japanese have abandoned rural areas in large numbers for jobs in urban areas. I was there in 2019, we were in a small city, surrounded by very small villages. Old family homes were being abandoned. Even in my old neighborhood, homes were abandoned and in bad shape. They had signs that basically gave the home to anyone willing to live there full time.
It will be those living in urban areas in formally first world countries like Japan that will suffer the most with energy and food shortages. Peoples living in rural areas, after a period of adjustment will be okay.