Needing to explain contracts makes this weirdly easier to start.
"What would you do, if something came to you and told you it could grant you a single wish? Anything at all. One miracle in exchange for having to fight evil for the rest of your life." A beat. "It sounds too good to be true, right? Like, there's no way that would work out, right?" It sounds especially obvious in retrospect.
"Well... That's how we became magical girls. Me, and Mami, and Homura. And who knows how many other girls back where we're from. You make a contract, and you're given a single miracle, and then you get your very own magic. And then you have to put your life on the line to fight."
no subject
"What would you do, if something came to you and told you it could grant you a single wish? Anything at all. One miracle in exchange for having to fight evil for the rest of your life." A beat. "It sounds too good to be true, right? Like, there's no way that would work out, right?" It sounds especially obvious in retrospect.
"Well... That's how we became magical girls. Me, and Mami, and Homura. And who knows how many other girls back where we're from. You make a contract, and you're given a single miracle, and then you get your very own magic. And then you have to put your life on the line to fight."