USJ is a popular theme park, so it gets crowded at various times of the year, including weekends, national holidays, long weekends, spring break, summer vacation, winter vacation, Christmas, and more.
Even if you visit during a time when it seems like it will be quiet, it can be difficult to enjoy yourself to your heart's content, as it can overlap with school trips or field trips, or with overseas holidays, making it overflowing with tourists.
If you purchase an annual pass and try going on different days, you may be able to get a general idea of how crowded it is.
It's also a good idea to use a guidebook or express pass to research ways to get around the park while avoiding the crowds.
Since there are a lot of people visiting the park, restaurants and shopping registers will also be crowded.
The entrance gates and coin lockers will also be crowded.
The roads will be crowded during parades, and the areas where shows are being held will also be crowded.
If you want to avoid the crowds as much as possible, do your research and gather information carefully in advance, and make sure to check the information within the park on the day.
The surrounding roads and traffic on the way to and from the park will also be crowded.
If you really want to avoid the crowds, your only option will be to get there a little earlier than everyone else, but since you're at USJ, it would be good to spend the day with enough peace of mind to be able to enjoy the crowds and waiting times.
About the crowds at Universal Studios Japan