Demon Academy is a strange school in an unknown space. He covers an area of hundreds of thousands of acres, and the number of students and faculty members in the school has reached as many as 3 million. Here, you will not be taught any scientific knowledge, only one thing, and that is how to become a demon. Killing, setting fires, and teasing others are commonplace here, even if you can kill a teacher, but you first have to measure whether you have the ability.

Of course, with so many people, eating is also an issue. There is a cateen in the school, where students can eat as much as they want without paying, but meals are not so easy to eat. First, the canteen only cooks meals for about 2.9 million people every day, that is to say, about 100,000 people are destined to be unable to eat every day, and there is only one way to survive, and that is to take it from others. Second, there will be some poison in the dining hall occasionally, and if you accidentally eat it to death, no one can blame you.

Every year, a large number of students are recruited from Earth. Once you're in, it's hard to get out of here. Legend has it that there has been only one person who has left the Demon Academy from the beginning to the present, and he is known as the "Doomsday Reaper", a figure who once terrified the teachers and students of the Demon Academy. Here, a graduation exam is held every three years. The content of the exam is simple, 100,000 people take the exam, and in the end only more than 100 people can graduate, which means that all the rest will be eliminated. There is only one fate for those who are eliminated, and that is death. So, there is generally no faith