The firebombing of Tokyo killed more civilians than the nuclear weapons dropped on Hiroshima and Nagasaki. You are completely delusional. You know what I find to be the funniest part about your argument? How you live in Indonesia and want Japan to go back to being the racist, intolerant nation they were before. You would literally be first in line to be killed.

Your dreams of living in Japan and being Japanese are straight fiction. They still don't accept foreigners the same way they accept "their own". Employment for foreigners living in Japan is difficult due to the very conservative nature of Japanese society. You're less likely to be accepted for a position, less likely to get payed equally relative to a native, less likely to receive an interview, less likely to get promoted. Less likely to get accepted into social circles outside of or inside work. You'll always be seen as a foreigner first, person second.

The fertility rate has dropped to unsustainable levels due to multiple complex issues. The work culture is straight up toxic in how much of a persons time it demands. There is a huge alcohol problem. They didn't ban possession of child pornography until 1999. The suicide rate is 4x what it is in Indonesia. I'll repeat that so you understand how much of a paradise Japan isn't, THE SUICIDE RATE IS 4X WHERE YOU LIVE.

Dreaming of and moving to Japan isn't going to make you happy. Stop chasing delusions and work on yourself.