These are URL of posts about Permanent Residency in Japan.
Requirement for Permanent Residence in Japan
First thing you have to do is to know whether you meet the requirement for PR.
2019 new rules on Permanent Residence in Japan explained.
There is amendment of guideline of Permanent Residency by Ministry of Justice in 2019.
Getting Permanent Residency in Japan for 1 year with Highly Skilled Professional VISA
If you are highly skilled professional, you might get PR within a few years.
Your misunderstanding on Permanent Residency in Japan
Please also read this post there is so much misinformation about PR.