The Fortuna sponsorship is how I imagine she'd be able to obtain resources, as she can explain the situation to them. Securing a deal is the second thing she does (after locating Alfonse and Sharena). It'd probably involve having Heroes perform for the company too, making it mutually beneficial.
"What if the Fire Emblem characters were transported to Tokyo, their memories intact and needing to figure out who did this to them?" Well, someone would surely need to work to unite them. Someone who would be able to recognize them, and with the leadership skills to oversee it. So: Commander Anna!