Ep. 4: Rule Duel

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Yuma's been appointed Class Representative! While Yuma is quite eager and willing to do the job, Takashi Todoroki, known by all as "Class Representative", has mixed feelings about this. The Student Council President appears before Takashi, appointing him as the "Chief Disciplinarian". The Chief Disciplinarian's job is to crack down on violations of school rules, which ends up angering a lot of students at the academy. In order to stop this ridiculous system, Yuma challenges the Student Council President, who turns out to be under Barian control, to a Duel! (Source: Yu-Gi-Oh! Wiki)