It is the Taisho Period in Japan. Tanjiro, a kindhearted boy who sells charcoal for a living, finds his family slaughtered by a demon. To make matters worse, his younger sister Nezuko, the sole survivor, has been transformed into a demon herself. Though devastated by this grim reality, Tanjiro resolves to become a "demon slayer" so that he can turn his sister back into a human, and kill the demon that massacred his family.
Tanjiro Kamado, joined with Inosuke Hashibira, a boy raised by boars who wears a boar's head, and Zenitsu Agatsuma, a scared boy who reveals his true power when he sleeps, boards the Infinity Train on a new mission with the Fire Hashira, Kyojuro Rengoku, to defeat a demon who has been tormenting the people and killing the demon slayers who oppose it!
Shiro Emiya is a young magus who attends Homurahara Academy in Fuyuki City. One day after cleaning the Archery Dojo in his school, he catches a glimpse of a fight between superhuman beings, and he gets involved in the Holy Grail War, a ritual where magi called Masters fight each other with their Servants to win the Holy Grail. Shiro joins the battle to stop an evildoer from winning the Grail and to save innocent people, but everything goes wrong when a mysterious "Shadow" begins to indiscriminately kill people in Fuyuki...
