That Time I Got Reincarnated as a Slime, Vol. 19 (Light Novel): Volume 19

Rimuru and his forces fight heroically on all fronts to stop Michael's plan...only to lose the demon lord Leon to Feldway's schemes. Michael's next target is Masayuki the Hero, who possesses the soul of Ludora, Michael's former host. There to meet him in battle are the paladin Hinata, the Primal Demon Blanc, and Velgrynd the Flame Dragon. But just when Michael begins to set things in motion, the situation devolves even further into chaos...