People take photos in front of Toho Cinemas Shinjuku of a “Demon Slayer the Movie: Mugen Train” sign on the opening screening day. The photo was taken in Tokyo’s Shinjuku Ward on Oct. 16. (Tsubasa Setoguchi) The tale of a boy fighting human-eating demons which murdered his family, “Demon Slayer” is poised to become Japan’s top-grossing film ever, thanks to a boost in fan numbers due to the coronavirus pandemic and its message of resilience. Based on a popular manga and TV anime series, the film has spun off an industry of related merchandise and has won over fans with its nod to Japanese traditions people fear are missing today.