This is from Haru's view, just to clear any misunderstandings.
Breaking
Because she knows, not just subconsciously aware, but knows with certain clarity that her boys were not playing mafia, like how children in her neighborhood played at cops and robbers running about in childish enthusiasm. No, she knows that the time her boys are gone that they are dealing with yet another threat, yet another ridiculous training regime to defeat their attackers, and returning home from yet another battlefield all bloody and battered, barely keeping themselves from keeling over in exhaustion. They would laugh off their injuries from curious stares of classmates, claiming to have gotten them in some stupid accident, or from a brawl amongst themselves that they never had, but she knows otherwise.
And it broke her heart to see them always go off to yet another battlefield, to fight and keep their Family safe and happy and unaware of what they had done for them.