Toya Aoyagi has a cyborg arm because he lost it in a battle along time ago, he’s a really good fighter and gun user. He met his partner Akito since they kept bumping into each other each time, so the best thing to do was to team up since both were good fighters. Toya doesn’t like mentioning his past or anything about his cyborg arm, but he preserves and tries not to get distracted so he can survive.