Wizards in the Demon Slayer World

Harry and Hermione traveled through time and space to the world of Demon Slayer: Kimetsu no Yaiba when they were attacked on official duties. Faced with a ghost more evil than Voldemort, they had to join this thousand-year war in order to survive and justice, and to find a way back. Faced with two people who have similar abilities to ghosts, can the Demon Slayer Corps accept them to fight side by side? What changes will the arrival of the two bring to this thousand-year war?