It’s such a funny thing how Japan treats friends in high school separating and growing apart a inevitablity after graduation and while yeah that does happen to feel like in the current age of smart phones and social media that kind of thing is way easier to have friends keep in touch
It's the kind of thing that commonly occurs every where, even in this day and ages. If anything, because of how easy it is to keep someone's contact, people tend to take it for granted and not pour enough effort/invest enough time to keep the friendship alive, which ultimately resulted in friendship falling apart because there wasn't enough communication and at one point, it became awkward when people don't know if they should reconcile or contact their long lost friends after a long time not talking to each other. Though, it's not essentially a bad thing. Most people don't stay in a place for too long, environment surround them change will lead to their social circle change, and everyone is too occupied with their new lives to keep up with their old friends.