Kattobingu

"Kattobing" (Kattobingu, in Japanese) is a word used by Yuma Tsukumo to give him strong. He learned it with his father, Kazuma Tsukumo when they were climbing a high mountain. This simple word cheers Yuma Up and make him do not give up. He often use it while he is in a hard duel, showing determination. On Episode 47, III Uses his Crest to Yuma forget the word "Kattobing", then, he coudn't see The Emperor's Key or Astral. This moment, he lost all his courage and started dueling Bad.