Chapter 75, "Visit To The Elderglow Academy V", is the clearest early answer because it turns Elderglow Academy's situation into a concrete plot event. The setup is The door pushed open revealing two young boys., but the pressure keeps building through One had slightly long silver hair, blue eyes, and a lean athletic....

Chapter 124, "Academy", is the clearest early answer because it turns Academy's situation into a concrete plot event.
Chapter 597, "Unharmed 2", is the clearest early answer because it turns Vajra Academy's situation into a concrete plot event.
Chapter 584, "Line Up", is the clearest early answer because it turns Onyx Academy's situation into a concrete plot event.
Chapter 504, "beginning (4).", is the clearest early answer because it turns Bandit Academy's situation into a concrete plot event.
Chapter 505, "Consequence", is the clearest early answer because it turns Bandit Academy's situation into a concrete plot event.
Chapter 647, "Collision 1.", is the clearest early answer because it turns Onyx Academy's situation into a concrete plot event.
Chapter 649, "Different Reactions.", is the clearest early answer because it turns Bloodline Academy's situation into a concrete plot event.
Chapter 587, "Shockwave.", is the clearest early answer because it turns Vajra Academy's situation into a concrete plot event.
Chapter 648, "Collision 2.", is the clearest early answer because it turns War God Academy's situation into a concrete plot event.
Chapter 631, "Moving Out 2.", is the clearest early answer because it turns War God Academy's situation into a concrete plot event.