Japanese historical television drama 'Brothers of the Great River' basks in overwhelming popularity, much to the delight of its producers and cast members. The series primarily focuses on the epic tale of Toyotomi siblings, providing a fresh perspective on their intriguing lives. The ratings have been thriving since it first aired, thanks to the unique combination of powerful storytelling, compelling performances, and exquisite cinematography.

In Japan, the Taiga drama plays an integral part in their television culture. They are historical dramas that are aired annually, and any successful show is regarded as a national accomplishment. The stupendous success of 'Brothers of the Great River', therefore, symbolizes the acceptance and appreciation of audiences for fruitful storytelling over conventional, dramatic plots.

In countries like the US or EU, successful TV shows are often identified by ratings and fan base, similar to Japan. However, the historical drama genre isn't as popular in the west, where shows are more often based on crime, mystery, or fantasy genres. Culturally, historic TV series are more significant in Japan, teaching past events and age-old traditions.