Japan had factories, of course, but a lot of the ancillary things to war, like uniforms, etc., were made in people's homes, rice and so on was reserved for soldiers and the surplus was then distributed in the communities. The economy was massively focused on furthering the war effort --even moreso than the US.
I think you need to listen and watch Japanese programming from that era to get the picture of how involved the civilian population was in the war effort.