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Accidents.
They are bound to happen in a space where many people have to be together and corporate with each other.
Especially in a competitive system like the one in the academy, there are always going to be accidents and they are inevitable.
Some were caused by the stupidity of the students themselves, some caused by environmental factors, some artificial ones that were caused by the forces of the outside ones, some clandestine powers that even the highest powers of the academy couldn't do anything carelessly about, and other factors that will always be the cause which, ultimately produce the results, or in this case, the accidents.
It was an academy, an educational institute that focused on the holistic growth of the individuals, and in an environment like this one there was bound to be prejudice, personal stereotypes, as well as limitations that would become the cause of the conflict.