Part 4 Special Interview Book, Volume 1 This book includes interviews with three groups: Natsuki Hanae, Takahiro Sakurai, and Akira Ishida; Hiro Shimono and Yoshimasa Hosoya; and Saori Hayami and Mamoru Miyano, each discussing "Demon Slayer: Kimetsu no Yaiba - The Movie: Mugen Train Arc - Chapter 1: Akaza's Return." It has been stored in a dark place after watching the movie. Discounts are available when purchased with other items.