In numerous corners of the universe, there exist a multitude of diverse worlds. Some of them are permeated with magic, while others, like Earth, are dominated by scientific achievements. But in one particular world, a conflict has been raging for centuries between two great forces - the "Ruler" and the "Hero". One day, their rivalry disrupted the structure of space to such an extent that the boundaries between many worlds began to blur. This fate gave rise to a series of events, full of unexpected surprises. And in the midst of this chaos, an entire class of students from our world becomes accidental victims.