Japan lost its spirit. 20yo women don't want to become a housewives or working on boring waigy works if they could earn yearly salary with one week of shooting porn. Surprise, incels, but sex is fun and enjoying. She also takes pleasure in her high paid ''job''.
Men don't want to marry or procreate too.

They are lost just like western countries. There is no reason for marrying and procreate anymore, people just having fun as much they can before their inevitable death.