Celestial Mountain Academy is situated on the tallest mountain on Earth, Mount Everest.
It's one of the tallest peaks, and before the apocalypse, no human dared to climb it. Of course, a few mountaineers actually managed to reach its summit.
Some attempted and died. Others gave up halfway, and some used unconventional methods to try to get there. There were even reports of people skydiving onto the top of the mountain.
It was a daring feat that sparked trends, encouraging many to attempt it. Of course, this also resulted in numerous deaths, but humans tend to find joy in challenging the impossible.
Humans are curious creatures. Even if something is dangerous, someone always wants to test whether it truly is.
The more they risked their lives, the more they seemed to gain the courage to risk them further. It was human nature.
Long story short, many died trying to climb that mountain. It was, to say the least, very strange.