The Supernatural Arrives: I Sacrifice an NPC from the Start

Either follow the rules, or become another soul claimed by them.

System notification:

Save him → Everyone breaks the rules and is doomed to die!

Report him → Get a pass, but he will die!

As the midnight bells ring and everyone presses the report button, a cold announcement echoes across the campus:

"Congratulations on unlocking the achievement: [Cold-Blooded]!"

In this academy that devours humanity, kindness is a luxury, and staying alive is the only rule.