is a Japanese manga series written and illustrated by Yuhiro Tsujitsugu. It has been serialized in Shogakukan's manga magazine Monthly Big Comic Spirits since January 2021. An anime television series adaptation produced by Studio Kai is set to premiere in April 2026.
Tetsuo, a shy boy, and his giant robot Yukio fight against monsters that threaten Earth from outer space. After the final battle, Tetsuo returns to Earth, only to find it covered in snow and ice. Tetsuo resolves to overcome his shyness and save what remains of humanity.
Written and illustrated by Yuhiro Tsujitsugu, Snowball Earth has been serialized in Shogakukan's manga magazine Monthly Big Comic Spirits since January 27, 2021. Shogakukan has collected its chapters into individual volumes. The first volume was released on July 30, 2021. As of December 26, 2025, ten volumes have been released.
In June 2023, Viz Media announced that they have licensed the manga for an English release in North America, and the first volume was released on April 16, 2024.
An anime television series adaptation was announced on July 17, 2025. The series will be produced by Studio Kai and directed by Munehisa Sakai, with Takeshi Iwata serving as assistant director, Shigeru Murakoshi handling series composition, Toshiya Kono designing the characters and serving as chief animation director, and Tatsuya Kato, Hiroaki Tsutsumi and Yuki Kanesaka composing the music. It is set to premiere on April 3, 2026, on the Friday Anime Night programming block on Nippon TV and its affiliates. The opening theme song is "Zero", performed by Tuki, while the ending theme song is , performed by . Crunchyroll will stream the series. Muse Communication licensed the series in South and Southeast Asia.
The manga was recommended by animator and director Hideaki Anno, video game creator Hideo Kojima, and manga artist One.