How to go through the procedures for Japanese immigration?

Method one, marry a Japanese.

Method 2: Find a way to come to Japan and live in Japan for more than 5 consecutive years.

In fact, your idea is inconsistent with the facts. Others come to study abroad first and then find jobs. They can become Japanese citizens after they have enough seniority.

In a vacuum, there is no other option except marrying or marrying a Japanese.