Cute but Cataclysmic

I unexpectedly awakened the "weakest SSS-class in history" Slime, which is recognized by the entire school. It's soft, squishy, and harmless-looking, and when it was ridiculed to the extreme by all of humanity, even fellow Beastmasters looked down on me. At that moment, the dormant system in my mind suddenly flashed with an apocalyptic warning, and the counterattack begins!