Cute but Cataclysmic

Cute but Cataclysmic

A student unexpectedly awakens a Slime, deemed the weakest SSS-class familiar in history, and becomes the laughingstock of their entire school, including fellow Beastmasters. However, a hidden system activates in the protagonist's mind, revealing the Slime's true catastrophic potential. The counterattack begins as the once-ridiculed student rises against those who underestimated them.