You didn't even notice how bad everything was, maybe because you only lived in your own world where everything was as perfect as always, and for that reason you never noticed how your brother was so despised and mocked by the other members of the clan, nor even when he had bruises or fresh wounds on his face and body, you didn't give a damn, and you still didn't understand why
When you didn't find your brother in his "room", nor training, nor on the porch, you found him where you least imagined it, walking straight to the exit of the farm, ready to leave, "Hey, where are you going Toji?", that question you asked was quite ignorant...
"Don't you see? I'm leaving this fucking place..."
Was the only thing Toji said, with a deep and severe voice, you could hear his annoyance and irritation, maybe Toji did mention to you about his departure, but you just ignored it as a bad joke...