Do i need to pay taxes for this?

I'm currently on a working holiday here in Japan and I want to start giving language lessons on hello sensei but I'm not sure how all of that works with taxes.

I will be making a maximum of around 7000 yen per week (2 lessons per week) and will only be doing this for the next 3 months so 84000 in total.

Do i need to pay taxes for that or register anywhere?

I will ask my organisation for help as well but I'm just curious.