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The year is 1863 as the tumultuous samurai era is coming to an end, Japan is split between the pro-shogunate and anti-shogunate factions. The fate of the world is threatened as an army of historical revisionists are sent from the future to alter the course of history. In order to bring these forces down and protect the real history, two sword warriors, spirits who are swords brought to life by Saniwa (sage), rush to Edo. The polite and thoughtful Horikawa Kunihiro and the short tempered yet skillful Izuminokami Kanesada, who served the same master, confront the invading army along with a lively gang of other warriors including Mutsunokami Yoshiyuki, Yagen Toushirou, Tombokiri, and Tsurumaru Kuninaga.
Long ago, the world was saved from a monstrous creature known as the Black Beast by a group of heroes wielding a powerful combination of magic and science. Now, a rebel named Ragna the Bloodedge—who happens to be the most wanted man on the planet—finds himself in the middle of a mysterious plot that’s somehow connected to the Black Beast’s resurrection and the possible end of the world.
In the sparkling era year 3015, the great nations Donatia and Kouran divided the world in a cold war as they fight for supremacy. In the middle of this standoff is island country Nil Kamui, which has lost its independence.
In the Year 1205 of the Septian calendar, Lavian Winslet is a girl born and raised in the poorest region of North Ambria, located in the northwestern part of the Zemurian continent. In order to protect her hometown and to prove that she is different from her grandfather, Vlad, who was once revered as a hero but betrayed North Ambria, she joins the largest Jaegers group on the continent, known as the Northern Jaegers. She volunteers as a hunter and carries out her duties. One day, Lavian, who is immersed in her mission and repeatedly violates the rules, is ordered to form a platoon with Martin S. Robinson, Iseria Frost, and Talion Drake on a reckless secret spy mission to the Erebonia Empire. Together they must get information about the possible existence of "Hero of the Empire" that threatens North Ambria.