Sorry, I thought the OP meant "best friends" in terms of "good, better, best". When we were in high school, my aunt used to say that the relationship between high school mates tend to last longest so we shouldn't take our mates lightly, but that has nothing to do with making new friends after that. Most people make "best friends" in terms of "extrememly close friends" both in high school and after, or of course even before high school.
Also, I wonder what age range or generation you're talking about. For example, if a person is fresh out of college and is working abroad, it's natural to assume that the person has not yet had the time to build a deep friendship in his/her current situation, because he/she would be too busy building a career. Additionally, he may not have had not enough time socializing in his/her college in Japan, because he/her was busy studying abroad. Then naturally, the person would turn to his/her high school mates when coming back to Japan.
But I'm 52 (and Japanese) now. After long years of not seeing my college mates, we reunited when our kids grew to be similar ages. Then we didn't see each other for a long time again, but reunited again when one got sick. Also, I always had a casual friend since 23, but I didn't realize how close we were until, 3 decades later, there came a time we needed to drop everything to help each other.
So there's a time in your life when the only people you can "feel at home with" are your high school mates. And, yes, that tendency can be stronger in places like Japan where one tend to scatter in college and then get very busy after graduation. But that doesn't mean you don't socialise or can't build a deep friendship later in your life.
In fact, for me, I always had thought that the least friendly people were my old high school mates. But now that we've overcome a lot of things (including distance, thanks to the internet) I realise that they were always there for me, and that I can go on not seeing them for ages and then meet up and suddently chat about parents and slumber parties like it was yesterday.
Back to the topic, university bonds tend to be so tight in Japan that we even have a word for it: Gakubatsu. This gakubatsu is even prohibited in most companies nowadays, because it's so strong that it may lead to lack of teamwork when those from other unis are present. We used to do gakubatsu get-togethers descretely and it was great fun with colleages of all ages from the same uni.
In any case, Japan still enjoys "igyoushu-kan-kouryuu" (socialising with those from different careers), "tate-gata-shakai" (the bond often too tight among seniors and juniors of a uni circle or career), "yoko-no-tsunagari" (the wider bond different from the tate thing), "mama-tomo" (mom-friends), "neko/inu-tomo" (pet cat/dog-friends), "chou-nai-kai" (street block communities) and so on.
But I must admit that nowadays the "go-ji-kara-otoko/onna" (the after five guys/gals) are fading, as the younger generation prefer to skip the booze to go home to their wife and children.
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