Japan has a gift giving culture. The gift is called OMIYAGE in Japanese, something from the place you visited or you were in. It is deeply embedded in Japanese culture.
It will be a good idea to bring little something for people who help or work for you.
Best Low Cost OMIYAGE
In my decades of US OMIYAGE experience, the best casual OMIYAGE to Japanese is Trader Joe’s shopping bags. Japanese people, especially females love the affordable bags.
Bags but No Store
There is no Trader Joe’s stores in Japan but you will see the bags often in big cities as they are popular among Japanese. Some even buy them online paying 3 times of the original price. Anyway get some before you leave, they will help you!
About Japanese OMIYAGE Culture
I have found this website, especially comments from foreign residents in Japan interesting. So read it before you go.