Last episode: pretty good
Rest of the show: not so good
Honestly, they needed more fanservice. Like the soypoint "oh wow that's so wacky but cool" kinda fanservice. I know it's adapting source material, but like, for a sidestory, man could they have made it more indulgent.
I couldn't tell you what happens in each episode. There's basically kid Megumin, school, hot springs town, then starting village. Nothing that happens in each one matters. I wonder if this prequel is even required watching since it doesn't look like the villains are reoccurring. Anyways, it's been such a long gap since the original I don't remember it. Skill issue I guess.