Going to language school and job hunt

I am currently considering attending a language school and job hunting in Japan.

I am looking for a job mainly in the food industry(both manufacturing and service) or the dietary supplements industry, but I'm flexible since I want to live in Japan long term.

I am 24, turning 25 at the end of this year. I graduated with my MS in food science and nutrition. I have internship and lab experiences, but no formal job experience. I got my N1 last December. I also speak English and Chinese fluently. I talked to a friend of mine who went to a Japanese university as an international student, and they managed to find work pretty quickly during their senior year, and they think it's worth a try for me as well.

I looked into some big language schools(ISI, JCLI, etc) and they all seem to offer some support for job hunting.

Is this sort of program and way of finding a job a good idea? If anyone has any advice on language school, or applying for jobs in Japan I would really appreciate it.