Accidental Side Job Tax Issues

Hey everyone,

I am currently working as an ALT through a board of education, which makes me a public servant. I was aware when I started the job that getting a side job as a public servant was not permitted, but I was naive and didn't realize that just selling things online could technically count as a side job. I just thought it meant I couldn't be employed somewhere else. I made plush toys as my hobby and sold them online. My total sales just barely exceeded 200,000 yen, but with the cost of materials and shipping, I didn't actually make a profit. However, since it's over 200,000 yen, it's necessary to report the income, right? I am very worried about my taxes concerning this. I am planning on switching jobs in March, right around tax time. Should I be concerned about possible legal or immigration related trouble if I report this income? How can I go about reporting it?

Thanks in advance.

by grapefruitcanteloupe