This article says 1.5% of Japanese males are hermits [1] which shows the desolation that faces the Japanese young. This article [2] outlines the declining marriage rates.
[1] http://www.bbc.com/future/story/20190129-the-plight-of-japan...
[2] https://www.meiji.ac.jp/cip/english/research/opinion/Akihiko...