Rise With My Hidden SSS-Class Zombie

After losing a summoned beast, a disgraced necromancer is expelled from university and accidentally summons an FFF-rank zombie from another world. But the tiny undead is secretly a terrifying Zombie King with limitless evolution paths and devastating SSS-tier powers. As corrupt elites and deadly bosses close in, the weakest summon on campus begins an unstoppable rise—one evolution at a time.