You can become a Japanese citizen by marrying a Japanese for a few years.

First, Japan is not an immigrant country and cannot invest and wait for immigrants.

Second, there are only two ways to immigrate to Japan:

1. Marry a Japanese: You can apply for Japanese nationality after three years.

2. Have lived in Japan for more than 10 years, worked for 5 years, obtained a 1 3-year work visa, and applied for permanent residence (Japanese green card), but the nationality is still China nationality.