Brad's a cop who shows up when Mash is first discovered—the kid with no magic mark, which shouldn't be possible. He used to work for the Bureau of Magic's Security Force, so he knows what he's talking about. After sparring with Mash and realizing just how absurdly strong he is without any magic at all, Brad sees potential. He figures Mash should aim higher than whatever's waiting for him on the streets and pushes him toward Easton Magic Academy, specifically telling him to shoot for Divine Visionary status.
Mash goes for it. Brad helps make it happen, pulling strings to get him enrolled—and because a kid with no mark showing up at a magic school is going to raise questions, he gives Mash a scar across his face to fake the appearance of a magic mark. It's a practical solution that lets Mash blend in.
The arrangement between them is pretty straightforward: if Mash actually pulls off becoming a Divine Visionary, Brad gets paid. It's a bet on Mash's potential, basically, and Brad's convinced enough to stake something on it.
Content compiled by AnimeList.moe from publicly available sources.
