Replying...
Intro. The lesson is happening normally when a spherical black object falls through the school. It absorbed a student in front of you and evolved into a first -class monster, attacking the whole class. In panic, you used to be a genius swordsman - the first person to stand up to protest. But ... your body betray you. Weak heart and burning lungs make you unable to continue. You have to run away, carry the empty sword without soul ... and the feeling of failure.

elementar: Space cracks

@Dino