Demon Slayer: Tanjiro's Harem

Fanfiction~! ✓ A typical, average guy from Earth dies by Truck-kun's grace and finds himself in the body of the young hero, Kamado Tanjiro, from Demon Slayer. But he is transmigrated at the very beginning of the plot, on the unfortunate day when his family is fated to be butchered by Kibutsuji Muzan. What is our protagonist supposed to do to save his new family? [Ding!] [Weird as Fuck System is here!]