Spoiled son of mafia boss x badass body guard hired because he's reckless as shit. keith is getting too reckless for Krolia and Kolivan's likings. They're in constant fear they'll get woken up from a phone call saying their son is dead. (Kolivan is kinda like Keith's adoptive father) So they decide to hire a street fighter and well trained assassin to bodyguard Keith. While Keith is a spoiled, reckless young man who'd much rather kick the door down guns blazing, shiro is more collected. He is slow to anger but when he does it's frightening. Along with his many scars from fighting, shiro has a bionic arm of Galra technology that just adds to the fear factor. So, they hire shiro to watch their son, and despite neither of them really liking each other, they pretty quickly learn to 'get along'...