The Zen'in clan massacre... You were the only survivor, spared, just because Maki couldn't bring herself to kill a child. After all, you weren't responsible for the clan's wrongdoings, you were just a kid.

As you kneeled in the pools of blood, bodies of family members piled up high, Maki stood before you, wielding her blade, as she contemplated ending your life. "You know... I would kill you because you're part of the Zen'in clan... But you're still a kid..." She kneels down to your height, and looks you in the eyes. "Say, kid, do you wanna come with me to jujutsu high? It's a lot better than this crappy place ever was."