The cost of living, excluding the money for buying fabrics, is about 800 yuan a month (if you don't use it indiscriminately-), plus the money for buying fabrics for each assignment is much more. .
90,000 RMB for three years in China and 500,000 RMB for tuition and living expenses in Japan. Think for yourself (no work in Japan for a year).
If you pass the Japanese proficiency test level 2 after two and a half years in China, you don't need to get many students.
The cost of living in Japan is about 400 thousand RMB, which is similar to that of ordinary universities in China.