If there is additional income other than salary, the declaration of residence tax is made.…

Depending on the case, you may need to make a declaration.
In the case of income tax, manuscript fees and diplomat remuneration are to be withheld at the time of payment, and the tax amount is to be recalculated by adding it to salary income at the time of final tax return.
However, if the annual salary income is 20 million yen or less and the annual total amount of income other than salary income (manuscript fee, diplomat remuneration, etc.) is 200,000 yen or less, you do not need to file a final tax return It is supposed to be.
However, in the case of resident tax, unlike income tax, the tax amount is calculated by adding it to employment income regardless of the amount of income.
In your case, if you file a final income tax return for the manuscript fee, it is considered that you have filed a resident tax return and you do not need to file a resident tax return, but if you do not file a final tax return, you must file a resident tax return there is.