The family, in an attempt to save Yuuka, entice the monkeys of the island with free food and a huge party, while Yuuka becomes friends with the mad doctor of the island, who later turns out to be one of Hyouka's many creators.
Kana Hanazawa
Yūka Midarezaki
Ayumi Fujimura
Kyōka Midarezaki
Takayuki Kondo
Ōka Midarezaki
Haruka Tomatsu
Chika Midarezaki
Keisuke Oda
Ginka Midarezaki
Hiroki Yasumoto
Teika Midarezaki
Ryo Hirohashi
Hyōka Midarezaki
Rina Sato
Gekka Midarezaki
Rika Morinaga
Shiruku Kirisaki
Eri Kitamura
Akeru Nishikura
Shinji Kawada
Dr. Gebok
Yuko Goto
Raichō Hiratsuka
Satoshi Hino
Rindo Katsura
Ayako Kawasumi
Dr. Hell
Hideo Ishikawa
Dekamelon
Kan Tanaka
Inuhiko Saruwatari
Mai Nakahara
Chieri Sakurai
Minako Kotobuki
Hijiri Yamaguchi
Momoko Saito
Odessa A. Griffin
