In a world where demons lurk in the shadows, Tanjiro Kamado, a young demon slayer with a noble heart, embarks on a new mission alongside his loyal companions Zenitsu and Inosuke. Following the events of their last battle, they board a mysterious train known as the Infinity Train, where several unexplained disappearances have terrified the locals. This seemingly normal train is, in fact, a portal that connects reality with the darkest nightmares.
As the three friends embark on their journey, they encounter the formidable Flame Hashira, Kyojuro Rengoku, who will help them face a powerful demon known as Enmu, who has the ability to manipulate the dreams of his victims. Falling into a deep state of sleep, each of them confronts their own fears and desires, revealing hidden aspects of their pasts and testing their determination.
The battles against the demons are not only physical but also emotional, as each of them must fight against their internal demons just as much as the dark threat looming over them. With dazzling animation and breathtaking action sequences, the journey on the Infinity Train becomes an explosive struggle for survival, where friendship and bravery are the only hope of making it out alive and defeating the forces of evil.