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Ranking of Kings: The Treasure Chest of Courage
Ousama Ranking: Yuuki no Takarabako, Ranking of Kings: Treasure Chest of Courage, 王様ランキング 勇気の宝箱, Ranking of Kings: The Treasure Chest of Courage
'A treasure chest of unspoken courage is opened.'The special is described as a collection of shorts, showing past instances of courage and personal growth by the cast of Ousama Ranking. (Source: Ranking of Kings Wiki)