Japanese immigration agency

I'm going to Japan next year, and I'm already applying for residence. I am a Japanese immigrant and choose to study for my children. She has asthma and can't stand PM2.5 in Tokyo. In addition, I don't want her to accept the high-intensity study pressure in China and want to give her a wonderful childhood, so I decided to immigrate to Japan. And Japanese schools have no tuition and medical care. It's all worth it for the children. It is held at the Learning Valley Institution.