I just came back from staying for over a month in Japan so now I can share my experience!
It was my first time visiting there but I decided not to go to very touristic areas to force me to practice the language more. Turns out even at the airport a lot of people barely speak English so it was a lifesaver to know the language a bit enough to ask for directions since my sim card didn't work.
People are usually very patient with you and will go above and beyond to help you. If you say hello to them they reply back, a little off guard sometimes but they do it XD
There was one time that the train stopped due to a malfunction and i didn't really understand the announcement (because my Japanese is not that good yet) and a man approached and kindly explained in English what was happening.
I also met a few neat people including an older lady who walks her old Corgi everyday on a wheelchair thing she modified because her dog can't walk. (I asked if I could take a picture of her and her dog because it was just too amazing)
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I met so many people, another time at a Dorayaki store I met the owner who kindly took me to a place I wanted to go to because it was a bit far by foot and even gave me some treats! I did give him one of my drawings from my sketchbook as a thank you because he was just too nice.
And I met this illustrator at a life drawing session organized by Janica, she wanted to hang out afterwards and took me to a very local very small Izakaya where the owner gave us a HUGE meal for free (meat, a lot of sashimi, snacks, etc). .__.
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Another time at a very local bus on a small town in the middle of nowhere, a grandma (which she called herself) suddenly gave us tons of candy she took from her bag.
I have many stories that I want to illustrate at some point XD
Some people might speak English but if you really want to get to know people, (like mentioned above) it helps to know the language of the country you're going to travel to. You're not going to regret it.
Also, if you can watch videos and read about their culture (manners, etc) , that will be an awesome aid to you!
Edit: I really liked japan, but I stayed mostly on rural areas / small cities to avoid people. I hated Akihabara because there's too many people and it smells bad and it's noisy and I always get lost at the train station, but I wouldn't say it was a cultural thing. Mexico city is like that and that's why I don't like it either XD