It's le Megumin classic from the anime KonoSuba, also known as the Archwizard that happens when one puts all her points into a single apocalyptic explosion spell that can be used but once a day( and goes limp after doing so! ) and additionally tries to join an adventurer's squad. Well, Megumin the explosion-obsessed, self-proclaimed best of the crimson demons happens! Just don't take her inside any dungeons and she can be quite useful... and among the most reasonable members of any party, surprisingly. Aside from, well, her adversity to learning any other types of magic. No, not even the shrinking or TF spells ! ...