- Anna Nagase (Koyuki Hikawa (voice))
- Fuka Izumi (Miki Azumi (voice))
- Shoya Chiba (Minato Amamiya (voice))
- Satoshi Inomata (Yota Hino (voice))
The Ramparts of Ice — S1E4
Episode: Impenetrable
Air Date: 2026-04-23
Runtime: 24 min
Rating: 7 (4 votes)
Overview
At Miki's prodding, Minato clarifies his interest in her best friend. An unexpected visitor triggers Koyuki's bad memories, leading to a harsh outburst.
Main Cast ▼
Guest Stars ▼
- Sakura Shinfuku (Tsukiko Shimojima (voice))
- Chiaki Kobayashi (Tsubasa Igarashi (voice))
- Hazuki Ogino (Manatsu Atagawa (voice))
- Saeko Kamijo (Mari (voice))
- Manatsu Murakami (Muko (voice))
- Mitsuho Kambe (Mei (voice))
- Wakana Kowaka (Noriko-sensei (voice))
- Toa Yukinari (Suwa-sensei (voice))
- Atsushi Kosaka (Matsumoto-sensei (voice))
- Kento Shiraishi (Tanaka (voice))
- Toshiki Watanabe (Tanaka's Friend (voice))
- Hiromu Mineta (Nishi High School Student (voice))
- Masato Niwa (Nishi High School Student (voice))
Crew ▼
- Yasuhiro Nakanishi — Writer
- Hideo Maru — Key Animation
- Jouji Yanase — Animation Director
- Miki Ogino — Supervising Animation Director
- Keisuke Nakazawa — Key Animation
- Mayumi Yamamoto — Key Animation
- Tan Tian — Background Designer
- Koichi Ejima — Background Designer
- Tomo Shinzato — Background Designer
- Kunihiko Igarashi — Background Designer
- Sota Tanigawa — Background Designer
- Momoko Sato — Background Designer
- Sakura Matsushita — Background Designer
- Mika Watanabe — Compositing Artist
- Keisuke Nozawa — Compositing Artist
- Mako Mikami — Compositing Artist
- Maho Kuwata — Compositing Artist
- Ryuya Kezuka — Compositing Artist
- Yota Muraki — Compositing Artist
- Maho Tanabe — Animation Director
- Madoka Tada — Compositing Artist
- Misaki Morishima — Key Animation
- Yuuko Horikawa — Storyboard Artist
- Shigatsu Yoshikawa — Director
- Rikiya Suda — Animation Director
- Yoshiko Minamihara — Animation Director
- Ming Guang — Animation Director
- Liao Jialeren — Animation Director
- Yoshimi Imagawa — Key Animation
- Hiroshi Oikawa — Key Animation
- Kotaro Okazaki — Key Animation
- Kaoru Nagakawa — Key Animation
- Harumi Ozeki — Key Animation
- Atsushi Kasano — Key Animation
- Emiko Kataoka — Key Animation
- Kim Won-hoe — Key Animation
- Natsuko Saito — Key Animation
- Noriko Saito — Key Animation
- Shiori Sakashita — Key Animation
- Masaru Sano — Key Animation
- Hiroaki Shimizu — Key Animation
- Yousuke Toyama — Key Animation
- Nanami Tanaka — Key Animation
- Yuki Nishimori — Key Animation
- Osamu Nuita — Key Animation
- Ai Hirai — Key Animation
- Noriyoshi Yamazaki — Key Animation
- Keita Watabe — Key Animation
- NAKGAE — Key Animation
- Fu Jiasheng — Key Animation
- Ayumi Sunazaki — Production Assistant
- Mika Narukawa — 2D Artist
- Negi — Theme Song Performance
- Keigo — Theme Song Performance
- Kaito Yamada — Theme Song Performance
- Yudai Takenaka — Theme Song Performance
- Sojiro Oki — Theme Song Performance
- Natsuki Yamada — Opening/Ending Animation
- Nobuhiro Arai — Opening/Ending Animation
- Ayako Ishihara — Opening/Ending Animation
- Mio Araki — Opening/Ending Animation
- Atsuko Ishida — Opening/Ending Animation
- Shinpei Kobayashi — Opening/Ending Animation
- Ayumi Abe — Opening/Ending Animation
- Ai Takashi — Opening/Ending Animation
- Yuuki Gotou — Opening/Ending Animation
- Shun Murata — Opening/Ending Animation
- Emi Mori — Opening/Ending Animation
- Nanako Ninomiya — Opening/Ending Animation
- Ranko Nakabayashi — Opening/Ending Animation
- Keiichiro Honjo — Opening/Ending Animation
- 36.5°C — Opening/Ending Animation
- Keisuke Nakazawa — Opening/Ending Animation
- Misaki Morishima — Opening/Ending Animation
- Miki Ogino — Opening/Ending Animation
- Hina Kobayashi — Opening/Ending Animation
- Ryuken Toida — Opening/Ending Animation
- Harushi Ejima — Theme Song Performance
- Kazuma Mitsuyasu — Theme Song Performance
- Yuki Uemura — Theme Song Performance
- Shizuku — Theme Song Performance