Is there a limited purchase for traveling to Japan?

The purchase restriction is only for extremely tight goods, or special goods. Don't mind too much. Even if you buy two in this store, you can buy two in another store.

When entering the country, if the customs finds that the quantity of a certain commodity is too much, which obviously exceeds its own use, it will be taxed. (How much more than personal use? It's hard to say. A box of masks is definitely not good. )