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Boji's cruel half-brother Daida is the main antagonist of the first arc—doing everything he can to prevent Boji from claiming the king's throne.
Only Sousuke Toka can do that, and for all the basis of watching Ousama Ranking in these past 6 months, I have felt nothing but happiness, love, sadness, anger, and the most important of all: the fear factor that continues to shake as the series progresses.