The 'The Heike Story' anime generally depicts the rise and fall of the Heike clan. It shows their power, the battles they were involved in, and their ultimate downfall. It's full of political intrigue, samurai warfare, and the complex relationships among different characters in that historical context.
Some of the main characters in 'The Heike Story' are members of the Heike clan. For example, there are the clan leaders who play crucial roles in making decisions for the clan. There are also the samurai warriors who fight on behalf of the Heike.
Valhalla is the mythical hall of slain heroes in Norse mythology. It's where warriors who died honorably in battle are believed to go to feast and fight for eternity.
Valhalla Murders is fictional. It's crafted by the imagination of the writers and production team. Although it might draw inspiration from real-life events or themes, it's not based on a specific true story.