After the College Entrance Exam, I Became a Principal in a Haunted World

The Protagonist Can Use Top-Tier Horrors Without Side Effects, Preferably With a Phone That Talks Back

Looking for books similar to What Kind of Rank Is That? You Command Ghosts and Control Life and Death.

Please Recommend Stories Where a Strange Game Descends and Everyone Has to Participate, and the Male Lead Has a System

Supernatural Horrors Resurface, Killing by Rules, and Ghost Tamers