"Jūni Taisen: Zodiac War" is a 12-episode anime series based on the light novel by Nisio Isin. The story revolves around a deadly battle royale known as the Zodiac War, held once every 12 years. Twelve warriors, each representing an animal of the Chinese zodiac, are chosen to compete in a fight to the death. The victor is granted a single wish, with no restrictions, making the stakes immensely high.

The participants are identified by their zodiac signs: Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Sheep, Monkey, Rooster, Dog, and Boar. Each warrior possesses unique abilities and weapons tied to their zodiac animal, and their personalities and motivations vary widely. The tournament takes place in a sealed city, where the combatants must navigate a labyrinthine environment filled with traps and hazards while eliminating their rivals.

The narrative unfolds in a non-linear fashion, with each episode focusing on a specific character's backstory and perspective. This structure provides insight into their motivations, past traumas, and reasons for participating in the Zodiac War. The characters include Rat, a cunning and manipulative strategist; Ox, a stoic and physically powerful fighter; Tiger, a fierce and battle-hardened warrior; and Rabbit, a seemingly innocent but deadly assassin. Other notable participants include Snake, a cold and calculating fighter with a tragic past, and Dragon, a mysterious and enigmatic figure whose true intentions remain unclear.

As the battle progresses, alliances are formed and broken, and the body count rises. The series explores themes of survival, sacrifice, and the moral ambiguity of pursuing one's desires at any cost. The Zodiac War is not merely a physical contest but also a psychological one, as the characters grapple with their own fears, regrets, and the weight of their choices.

The story builds toward a climactic confrontation, with unexpected twists and revelations about the true nature of the Zodiac War and its participants. The final episodes delve into the consequences of the battle and the ultimate fate of the survivors, leaving a lasting impact on the viewer. The series combines intense action, character-driven drama, and philosophical undertones to create a compelling and thought-provoking narrative.