Travel to Japan, have friends in Japan, want to join a tour group to go to Japan, then travel by yourself, and then go back to China with the group after returning home, is it ok?

Specifically, it is like this: in principle, you are not allowed to leave the group when you sign up for a trip to Japan, because the travel society bears great risks and is afraid that you will illegally sneak in. If you sign up for a classic tour, such as Tokyo and Osaka, you can't travel freely, because the itinerary is very tight and you have to go to many places in one day. At most, you won't attend Disney. You can play by yourself on this day, but you should tell the tour guide in advance. You have to contact the local communication equipment and give your passport to the tour guide before you can leave the group, and the premise may be that the travel agency will charge you a large deposit. Why don't you sign up for a free trip? Wherever you want to go, the tour guide doesn't follow, which is not much more expensive than signing up for a tour.