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Impenetrable

The Ramparts of Ice

The Ramparts of Ice · S1E4

Impenetrable

April 23, 2026

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.

Available in the United States on

Netflix

Netflix Standard with Ads

Streaming availability data provided by JustWatch

Episode cast

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)

Show full cast (8 more)

Kento Shiraishi

Tanaka (voice)

Toshiki Watanabe

Tanaka's Friend (voice)

Hiromu Mineta

Nishi High School Student (voice)

Masato Niwa

Nishi High School Student (voice)

Anna Nagase

Koyuki Hikawa (voice)

Fuka Izumi

Miki Azumi (voice)

Shoya Chiba

Minato Amamiya (voice)

Satoshi Inomata

Yota Hino (voice)

Show status

The next episode (S2E2) airs on October 8, 2026.

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