Mugen no jûnin: Immortal - Season 1 (2019)

Rin receives fighting training from Majin but when she finds his enemy Kagehisa Anotsu in a forest, she sees that she can't do anything yet to take revenge.

Rin and Manji the immortal guard find a Buddhist monk of the Ittou-Ryu who fights with Manji and is mortally wounded but resurrects being also immortal.

Rin meets Renzou, a boy son of the mask shopkeeper. Looking at his father, Rin recognizes the evil instigator of his parents' crime.

Ittou-Ryu swordsmen meet to see who is an instructor, but at the same time someone is killing them.

Manji and Rin involve the four known as Mugai-ryu, who hold information on Kagehisa, in order to assassinate him. Lying in wait on the road that leads out of Edo, based on information only known to Rin, she and Shira close in on Kagehisa as he tries to flee from the others.

Rin was told of Kagehisa's whereabouts by Giichi, and now her and Manji are suspected of indiscriminate murder. Suspected criminals cannot pass the checkpoint. But thanks to a maid who was acquaintance of Rin's, she has a countermeasure. She heads alone to a village that can help her slip through the checkpoint.

Manji wants to go after Rin, but he has no pass. That's when Souri and Magatsu appear before him. Souri tells Manji that he can acquire as many passes as Manji likes, but there's a condition. Meanwhile, a gray-haired, one-armed Shira appears before Hyakurin and Shinriji as they re-work their plan for assassinating Kagehisa.

Having become travel partners for the sake of their goals, Manji and Magatsu are mugged by a group of bald men. Manji, groaning in pain, is tackled from behind by Shira, who then cuts off Manji's arm.

Rin wanders around and finds her parents' murderer, Kagehisa, who is being hunted to death by the Shingoto-ryu.

The Ittou-ryu had its members slaughtered by the shogunate. Kagehisa gathers the remaining members of Ittou-ryu in secrecy, and plots revenge against the shogunate. Manji is invited to the Mugai-ryu by Giichi, but he refuses, and they clash swords. Giichi's weapon breaks, so a truce is called. Maji decides to go meet the head of the Mugai-ryu, Habaki.

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Manji is wounded from his duel with Shira. Renzou picks up a sword and tries to kill Manji, but Rin and the others talk him down. Meanwhile, Habaki is livid upon learning of the attack on Edo Castle. Habaki wants to pursue Itto-Ryu, even in absence of its leader. As a result, one of the Ittou-ryu enters a mountain village. Habaki's daughter, Ryou, tries to subdue him to be of use to her father.

Arashino, Hasshuu, and Murasaki of the Rokki-dan act as the vanguard in the clash with the Ittou-ryu. The crucial Abayama manages to escape with the help of his followers. But then he has to confront Giichi and Hyakurin, who pursued Abayama to assist Habaki.

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The lives of those gathered fizzle out one after another. Those remaining are battered and bruised. Yet still they take up their swords, and slam their convictions against one another. The last one standing... And the revenge that was fulfilled... The curtain now closes on the tale of the man with an eternal life, and of those people whose finite lives were a blaze of passion.