What are ways for a student to make a livable wage in the countryside?

Hello everyone,

I'm taking a gap year between graduating highschool in Germany and starting University here as to improve my Japanese and learn more about my home country's culture. I've completed all the setup (Phone number, Bank Account etc) needed to live and work here and am now looking for a job. I currently live with my uncle here in Nagano, my goal however is to rent my own apartment. What are jobs that can provide the kind of pay needed to sustain a basic lifestyle with 30-50k yen rents?

Thanks to everyone in advance!