When a headstrong street orphan, Seiya, in search of his abducted sister unwittingly taps into hidden powers, he discovers he might be the only person alive who can protect a reincarnated goddess, sent to watch over humanity. Can he let his past go and embrace his destiny to become a Knight of the Zodiac?
In the heart of a city, the inhabitants of a tower wake up one morning to find that their building is shrouded in an opaque fog, obstructing doors and windows - a strange dark matter that devours anything that tries to pass through it. Trapped, the residents try to organize themselves, but to ensure their survival they gradually succumb to their most primitive instincts, until they sink into horror...
One day, in the family manor, four cousins discover a passage to a mysterious world. Trapped in this unearthed land, the Kingdom of Keoherus, they must confront the Guardian of Time and face dark forces and beast to hopefully get home.
After his family is viciously murdered, a kind-hearted boy named Tanjiro Kamado resolves to become a Demon Slayer in hopes of turning his younger sister Nezuko back into a human. Together with his comrades, Zenitsu and Inosuke, along with one of the top-ranking members of the Demon Slayer Corps, Tengen Uzui, Tanjiro embarks on a mission within the Entertainment District, where they encounter the formidable, high-ranking demons, Daki and Gyutaro.