Genya Shinazugawa (不死川玄弥) is a supporting character in Demon Slayer: Kimetsu no Yaiba Infinity Castle, voiced in Japanese by Nobuhiko Okamoto. The series' music includes "Demon Slayer Infinity Castle - Theme Song FULL "A World Where the Sun Never Rises" by Aimer", "Demon Slayer Infinity Castle - Theme Song FULL "Shine in the Cruel Night" by LiSA".