Video : Graduation Duel! Chronos vs. the Original Dropout Boy

When Crowler looks at the Graduation Album, he begins to act abnormal. He conducts rigid classes for no reason, suddenly make his students dictate multiplication tables and make them do push-ups... in the end, they end up boycotting the lessons and fleeing. Jaden then challenges Crowler to a duel, the first since the entrance exams.

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S04E12 - Graduation Duel Starts! Neos vs. Horus the Black Flame Dragon