It feels like either Rize's brother was broken insane (looks like abuse to me) and he must've tried to do something to Kairi to the point that Kairi killed him on self-defense, either that the brother killed himself and Kairi didn't try to save him. Any way you look at it, Rize's brother had...
Another retarded hero who gains 5000 skills by killing off monster but uses only 10 (in also very retarded ways) and who swears to take revenge on god instead of the old fart who pushed him off. What a waste of an artist's time..