What essential items should you bring with you on a study trip to Japan?

It’s a school trip, it’s during the summer vacation, it won’t last long. So it can be simple, and it doesn’t cost too much, because it is a school organization, but you can bring some souvenirs with you. Clothes for daily life are a necessity, 3 or 4 sets for a change. If you have a mysophobia, you can bring your own toothbrush, towel, and pajamas. Bring 2 or 3 books with you and read them when you have nothing to do. You can bring a camera to take photos. The passport school should keep it together, so you don't need to take care of it. That's pretty much it.