Yes it's a no-pay job. I may consult with my boss about the lunch and transport fee.
In fact, my school is also looking for OLE (Other learning activities clas, one hour and 20 min per week, a proper paid job) teacher for new subjects. At the moment, we don't have Japanese class. I may suggest to my boss. If you think you are capable of doing it, please send me your C.V.
i thought you are looking for something rather than volunteering. It was just a suggestion. I'm aiming at looking for those who are willing to work without paid.