On December 24, 2029—the day colloquially known as the Lost Christmas—the Apocalypse Virus spread across Japan, bringing death to its citizens and plunging the country into utter chaos. In an effort to establish order, the United Nations sends the GHQ to assist with the crisis by containing the outbreak while removing all political autonomy in the process. A decade later, the country still lives under their control, unable to break free from their draconian rule. Frustrated with the state of the nation, a resistance group named the Funeral Parlor aims to liberate Japan from the GHQ. Led by the charismatic Gai Tsutsugami, the group plots to steal a vial containing the Void Genome to further their goals. The vial falls into the hands of internet vocalist Inori Yuzuriha, who ends up being hunted by the GHQ's Anti-Bodies forces. Having nowhere to go, she seeks refuge in a warehouse where she meets Shuu Ouma—a socially awkward high school student who is a huge fan of her music. Shuu gets dragged into the conflict the moment he rescues Inori, and the Void Genome shatters in his hand, granting him the Power of the Kings. While learning how to control his grand new ability, Shuu must now fight to liberate Japan from its cruel oppressors.

He awakens in the dark forest of a mythical land with some type of leopard mask that he cannot remove. The only thing he remembers is his name—Guin—and that he is a warrior of unimaginable power. And when the two twins of Parros, innocent victims of a civil war arrive, Guin knows what he must do. But the journey to save the children means much more than just slaughtering a few hundred well-trained Mongoul soldiers. Victory means he must battle magical desert tribes, assemble forces that have fought each other for hundreds of hears, and divine a mysterious plan that he is central to. Prepare for a sweeping anime epic of mystery and magic! Of violent clashes and dark double-crosses. Ready yourself for the battle with Guin Saga. (Source: Sentai Filmworks, edited)

The war over control of a unified Japan, the Sengoku Era, is over and the Toyotomi army has won. Toyotomi has allowed his rival, Tokugawa, to live but since that final battle an evil ayakashi named Yasha reveals to Tokugawa that history says that he should have won the war instead of Toyotomi. Tokugawa agrees to the evil ayakashi power Yasha offers him, and the only person who can stop Tokugawa from ruling Japan and killing Princess Kaguya, who is the link to this alternate present, is Musashi Miyamoto, a young and brash man who follows the way of Gun-do, which mixes together swordfighting with gunplay. (Source: ANN)

Van, a lanky and apathetic swordsman, is on a journey to kill the murderer of his fiancé. The only characteristic he has to go by is that the murderer has a claw for an arm, hence the murderer being referred to as The Claw Man. During his travels, Van happens to pass through the city of Evergreen, which is defending itself from bandits who aim to rob the city of its treasury. It is in this city that Van meets Wendy Garret, a timid young girl who is looking for her kidnapped brother. When the city pleads for Van's assistance to defend it, he refuses, claiming it has nothing to do with him and thus leaves the city on its own to deal with the peril. Soon after, Van comes across the raiding bandits himself and they eventually tick off the swordsman to a degree where he takes action against them for his own personal vendetta. Surprisingly, Van learns that the bandits had ties with The Claw Man, and in kidnapping Wendy's brother for a reason they did not disclose. After the bandits are dealt with easily, Van and, much to his chagrin, Wendy continue the journey in search of The Claw Man. Little do they know, however, that The Claw Man is involved with something more atrocious than either could fathom.