Kuwata killed Sayaka to protect his own life because she attacked him with the goal to kill him. She invited him into Naegi's room without letting him know that she was waiting there. She wrote a letter and tried her best to fake Naegis signature. After he dodged two of her strikes with the kitchen knife, he pushed her against the wall and stole the knife from her. Before he finally killed her by stabbing her into the breast and chest, she flew into the bathroom, which was locked. At least she thought that... He kicked the door open and broke it that way. There he stabbed her two times again in the stomach and watched her dying. After everyone voted for him as the culprit, he dropped his story in which he was peacefully sleeping while Sayaka got killed and explained everything. "Even though it was to protect yourself... You still killed her and you knew that! It wasn't an accident or a misunderstanding... You knew what you were doing and that means you're still the murderer", Kirigiri explained and the others nodded in agreement. Leon understood what he did and accepted his soon coming death. Monokuma waited until everyone was silent before he grabbed his giant hammer and activated the Execution by hitting his big, red button.
Kuwata stands on a baseball field with a bat in his hand and a black and white helmet on his head, covering his red hair. Some Monokumas are distributed across the whole field on the position of the pitcher, the catcher and the field players. Kuwata seems to be the batter and he waits until something happens, looking around the field. The field is the center of an arena and every seat is taken by a Monokuma-puppet, which are waiting, cheering and doing the wave. Suddenly the pitcher throws his ball, which flies with an unbelievable speed. But Kuwata isn't known as the Ultimate Baseball Star for nothing. With a quick move and a fire in his eyes he hits the white ball perfectly. The white object flies in a 45° angle out of the arena and the crowd is cheering even more, until a loud explosion can be heard. The baseball was a bomb, which exploded outside the arena. Everyone is silent and Kuwata begins to sweat out of fear and surprise. A giant Monokuma-head appears behind the edge of the arena and stares at Leon, with anger in his red glowing eye and a band aid on his forehead. All the Monokumas are fleeing out of fear, but the batter can't leave. His fear and his shoes, which are fixed to his white position, won't allow it. Now he realizes that his position is marked as an X with a red dot right underneath him. The giant Monokuma stands up, which makes him more than double as big as the arena, in which he steps. The grass underneath him turns darkgreen, because the giant feet are crushing it. He pulls out a giant darkbrown bat and grins devilish at Kuwata, who gulps nervously and stares at the big bat with his wide open eyes. All the Monokumas are returning and cheering for the big bear, while he swings his bat in the air and laughs with his light voice. With one quick move he swings it down again and hits Kuwata, who gets flung away into the sky. All that is left behind is the bat of the red haired boy and his helmet, which falls from the sky a few seconds later... covered in blood.