Ughhhhhh okay so, she prepared this speech.
"Humans are the only known sapient species on my planet. There are other planets, at least one of them with another sapient species, the Kyubey. I believe there are more than just them, though."
"Magic is - discreet. Most people don't have it. It requires emotions that work a specific way, and as far as I know currently only humans qualify. We'd define it as stuff that breaks conservation of mass and energy - in my world, left alone, matter and energy can't be made or gotten rid of, only changed. People aren't born with magic. People who can get magic - almost entirely girls - are called potentials. Potentials can make wishes. The ones who're allowed to is currently controlled by the Kyubey."
"Wishes - range a lot. On the useful end, I've heard of everything from 'a lot of money, non-suspiciously' to 'mass mind control' to 'grant someone invulnerability' to 'resurrect the dead' to one girl who made herself unable to die at all. Because wishes are granted to kids, most people don't optimize them and make weaker wishes than their potential."
"Wishes grant the ability to use magic. The magic used by magical girls is powered by - and burns - hope. If I'm very hopeful, which usually means joy but I've managed it with anger, I can do more powerful things. If I do powerful things, I start feeling despair. If a magical girl uses too much magic, or separately falls into despair, she becomes a witch. I'm unsure if witches are sapient. They feed on people's emotions, and usually kill people - they'll cause someone to commit suicide or murder-suicide usually, sometimes just assault if they're weak. There's a way of offloading despair into grief seeds, which witches leave when they run out of magic, and I have a collection, so I'm not worried about running out of magic myself."
She has to pause, then. "There's more but I'm getting tired."