Poster for ‘Demon Slayer: Kimetsu no Yaiba Infinity Castle’ (Courtesy of Sony Pictures)Demon Slayer: Kimetsu no Yaiba Infinity Castle is still slaying it at the box office. The anime film fended off competitors to remain at #1 in its second week, adding an additional $17.3 million, according to Box Office Mojo. Downton Abbey: The Grand Finale and The Long Walk rounded out the top five, each with $6.3 million. Demon Slayer: Kimetsu no Yaiba Infinity Castle – $17.3 million2. The Long Walk – $6.3 million6.