Ep. 8: The Friendship Games

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At Girag's urging, Yuma holds a "Friendship Games" to help decide the representative for the Super Secret Number Hunter Investigation Club. Unbeknownst to him, Girag has brainwashed Kotori and Cathy. Ultimately, Yuma and Shark are to Duel them, but Shark, who doesn't want to waste his time, leaves at the last minute and is replaced by Girag. (Source: Yu-Gi-Oh! Wiki)