As explained at the beginning of the anime, “Sakakibara” is a name reminiscent of death in school in Japan. Japan has a history of school terrorism. There are few horror terms for horror anime, but there are many terms that you want to know in general. The tone of each character is exactly the same as that of real junior high school students and adults, and it is very good for learning how to speak.
The terms that appear are just difficult. Also, since the story itself is more difficult than the difficulty of the terminology, it is quite difficult to watch as learning Japanese.