Chiaki Kobayashi has been announced as a new cast member for the upcoming The Ramparts of Ice TV anime series. The anime is scheduled to begin airing in Japan on April 2, 2026.
Kobayashi will voice Tsubasa Igarashi (center). Additionally, character designs for Uppi (left) and Ponta (right) were also revealed.
© 阿賀沢紅茶／集英社・TVアニメ「氷の城壁」製作委員会
He joins a previously announced voice cast that stars:
- • Anna Nagase as Koyuki Hikawa
- • Fuka Izumi as Miki Azumi
- • Shoya Chiba as Minato Amamiya
- • Satoshi Inomata as Yota Hino
Mankyu (The Idolmaster: Shiny Colors, The Ice Guy and His Cool Female Colleague, Migi & Dali) is directing the anime series, with Teru Ishii as assistant director, Yasuhiro Nakanishi (Chained Soldier) as series composer, Miki Ogino as character designer, and Kanade Sakuma (The Most Heretical Last Boss Queen co-composer) and Natsumi Tabuchi (A Star Brighter Than the Sun co-composer) as music composers. Shueisha Margaret Editorial Department is credited with the source material co-operation, while Studio KAI is in charge of the animation production.
The anime is based on the web manga series by Kocha Agasawa (You and I Are Polar Opposites original creator), which was serialized on LINE Manga from January 10, 2020 to April 28, 2022. Shueisha published 14 tankobon volumes in Japan under the Jump Comics imprint between July 2023 to February 2025. The manga’s Japanese title is Kori no Joheki.
The manga received a special award at the 2nd Shueisha Shojo Manga Grand Prix (which has LINE’s involvement) and placed first in Comic Natalie’s Tateyomi Manga Award 2024 in the Completed category.
© 阿賀沢紅茶／集英社・TVアニメ「氷の城壁」製作委員会
Netflix will stream The Ramparts of Ice anime series globally on a weekly release schedule. It describes the main synopsis as:
Koyuki Hikawa is a socially withdrawn student who keeps an emotional wall between herself and others. The only person she spends time with is her childhood friend, Miki Azumi. One day, Koyuki’s quiet life is disrupted when a boy named Minato Amamiya inexplicably starts trying to break through her barriers.
The aloof Koyuki, the popular Miki, the overly familiar Minato and the laid-back basketball player Yota share an awkward, occasionally frustrating, yet wholesome student life.
An ensemble drama shaped by the crossed paths of youth is about to begin.
Sources: The Ramparts of Ice Official Twitter, Anime News Network
