Tensei shitara Slime Datta Ken 2nd Season - episode 4 - 01 Feb, 2021

Rimuru gives his last lessons to the children of Class S and Yohm returns to Tempest along his new companion, the magician Mjurran, unaware that she is a spy working for Clayman. Meanwhile, the Kingdom of Falmuth whose leaders view Tempest's ascension as a threat to their power make preparations to invade it. (Source: Wikipedia)