Summary
Ousama Ranking: Yuuki no Takarabako consists of short episodes highlighting courage and character development of Ousama Ranking's cast. Many of these shorts seem to be inspired by bonus chapters of the Ousama Ranking manga, which frequently provide additional context, background information, and updates on various storylines in the manga.
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Recomendations
Titles
Romaji
Ousama Ranking: Yuuki no Takarabako
English
Ranking of Kings: The Treasure Chest of Courage
Japanese
王様ランキング 勇気の宝箱