The SSS-Rank Slime Tamer

I unexpectedly awakened what the whole school recognized as the 'weakest SSS-Rank Spirit Beast in history'—a soft, bouncy Slime. When this cute and harmless creature was mocked by everyone for being utterly useless, and even fellow Beast Tamers looked down on me, the dormant system in my mind suddenly flashed with a world-ending warning, and my counterattack began!