Rimuru's dungeon is finally revealed, and his new ally Masayuki is among its first challengers. Later, after the festival is over, Rimuru's biggest job still awaits.

Cast: Miho Okasaki, Megumi Toyoguchi, Tomoaki Maeno, Makoto Furukawa, Sayaka Senbongi, Mao Ichimichi, Takuya Eguchi, Hochu Otsuka, Kanehira Yamamoto, Asuna Tomari, Chikahiro Kobayashi, Taro Yamaguchi