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Manji is an infamous swordsman in feudal Japan who is known as the "Hundred Man Killer," as he has killed one hundred innocent men. However, there is something far more frightening than his ominous reputation: the fact that he is immortal. This is the handiwork of eight-hundred-year-old nun Yaobikuni, who placed bloodworms capable of healing almost any wound in Manji's body. To atone for his crimes, Manji resolves to kill one thousand evil men. Yaobikuni agrees to this proposal, saying that if he succeeds, she will undo his curse of immortality. Soon after this promise, Manji meets Rin Asano, a 16-year-old girl who requests Manji's assistance in killing those who slaughtered her parents. Initially reluctant, Manji refuses Rin's desperate plea. However, owing to her evident lack of strength, Manji changes his mind and agrees to protect Rin for four years. With this partnership set in stone, the two embark on a perilous journey of bloodshed, vengeance, and redemption, each to fulfill their own life's cause. [Written by MAL Rewrite]

After escaping certain death, Kei Nagai and his new companion Kou Nakano plot revenge on Satou, their fellow Ajin who is hellbent on world domination. As Satou embarks on a string of public executions, the human race rushes to come up with a solution to stop the immortal villain. Kei discovers unlikely allies in the form of two former adversaries: high-ranking government official Yuu Tosaki, whose extensive research on Ajin gives him a tactical advantage in the fight against Satou, and Tosaki's Ajin assistant Izumi Shimomura. As his faction continues to gather allies, Kei races against time to put a stop to Satou's crusade before it brings about an end to civilization as he knows it. [Written by MAL Rewrite]

When the gods would not answer in humanity's desperate hour of need, it turned to a demon instead. The supposed savior came wielding the sword Zsoltgewinn, but its uncontrollable lust for blood led it to kill those who summoned it too. Although the sword was sealed away long ago, it has been uncovered by the Shoshidai, an organization that collects such cursed artifacts. However, Zsoltgewinn proves to be too strong to be tamed by humans when its corruptive power influences the administrator, Takuma Miura, to flee with it in his grasp. At the same time, Gai Ogata's family is torn apart due to the possession of another demonic sword, Shiryu, leading his father to be murdered and his mother to hang herself shortly after giving birth to him. Abandoned in the forest clutching the blade, he is discovered by the blacksmith Amon. Unnaturally transfixed by the sword, Gai works tirelessly for years to hone his smithing skills. However, when an accident costs him his arm, he gains a new one—in the form of a reforged Shiryu. Now having a cursed sword for an arm, Gai must learn to control its violent urges. All the while, Zsoltgewinn continues its rampage, leaving a path of blood in its wake. [Written by MAL Rewrite]

Part II of Sword Gai: The Animation.