KonoSuba – God’s blessing on this wonderful world!! - S1: Episode 4
Explosion Magic for This Formidable Enemy!
All of the weak monsters have gone into hiding since a leader of the devil king’s army has settled in near town. Kazuma, who had been focusing on improving his skills, is stuck at a standstill. With nothing else to do, Kazuma tags along with Megumin’s training, which consists of unleashing explosion magic into an abandoned castle.