People in Japan aren't actually that short
I recently visited Japan, and while I was usually the tallest person in the room wherever I went (I'm 6'2), I also have to say that Japanese people aren't THAT short. I feel like on this subreddit we like to think that people in Japan are comically short, but the reality is that most of the Japanese people I saw were perfectly average and it's not like I absolutely dwarfed them in height or anything. I've heard that Japanese people are a lot shorter than in other Asian countries, but I didn't notice much of a difference tbh (I'm Asian myself and I've been to a lot of places in Asia). It also wasn't that uncommon to spot other tall people there, and I even noticed some Japanese men who were like 6'5 or 6'6.