Looking back, it all began with Setsuka gouging out the little girl next door's eye. If she hadn't done that then all of this never would have happened.
I was only about three at the time so all I remembered was there being a lot of policemen at our house and that was just because I thought their badges were really cool. My parents must have been dying of embarrassment, because they sure as hell wouldn't have been dying of remorse. Never mind the fact that the little girl nearly died of shock and blood loss and never spoke coherently again, her psychological and emotional growth forever stunted. No, reputation was everything to them and this permanently tarnished it. I guess that's why they locked Setsuka away and never spoke of her again. Somehow even at the tender age of three, I knew better than to even ask them what happened to Onee-chan. I probably would have forgotten she ever existed, just like my parents wanted to if it hadn't been for Seishirou Onii-chan.
But then I guess a lot of this is his fault too.