Snowball Earth's first season concluded with a rushed finale and a second season announcement on the same day. The series is renewed but has faced consistent criticism for tonal imbalance, weak villain writing, and inconsistent CG animation.
The television anime adaptation of Yuhiro Tsujitsugu's manga Snowball Earth premiered on NTV's Friday night programming block on April 3, 2026, and streamed on Hulu. Studio KAI produced the animation, with Munehisa Sakai directing, Shigeru Murakoshi handling series scripts, and Toshiya Kono designing the characters. The first season ran 13 episodes, concluding on June 26, 2026, the same day a second season was announced via the series' official X/Twitter account, accompanied by a trailer.
Critical reception of the first season was largely negative, with reviewers pointing to a tonal disconnect between the apocalyptic premise and the protagonist's comedic social anxiety. The series follows Tetsuo Yabusame, a socially awkward boy who pilots a sentient mecha named Yukio. Reviews from Anime Feminist and Anime News Network criticized the show's inability to balance character-driven comedy with the gravity of its world-ending conflict. The CG animation for kaiju and mecha was repeatedly called out as distracting and inconsistent, particularly when contrasted with brief, high-quality 2D shots.
The antagonist, Colonel Sagami, was a recurring point of criticism. Episode 6 revealed his motivation as petty jealousy of Tetsuo, and later episodes attempted a forced redemption arc that reviewers found unconvincing and illogical. The season finale featured a rushed final boss fight lasting under four minutes, followed by a padded slice-of-life epilogue. Despite the weak finish, the second season announcement suggests the series will continue. Viz Media publishes the English version of the manga, which began serialization in Shogakukan's Monthly Big Comic Spirits in January 2021 and has released ten volumes as of December 2025.
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Episode 13 of Snowball Earth concludes the first season with a brief, anticlimactic final boss fight that ends in under four minutes, followed by a lengthy slice-of-life epilogue. The episode sets up a second season but offers little reason for excitement, according to the review.
The television anime adaptation of Yuhiro Tsujitsugu's manga Snowball Earth has been renewed for a second season. The announcement was made on the series' official X/Twitter account on June 26, 2026, the same day the 13th and final episode of the first season aired. A trailer for the new season was also released. The first season premiered on NTV's Friday night programming block on April 3, 2026, and is streamed by Hulu. Studio KAI produced the animation, with Munehisa Sakai directing. Shigeru Murakoshi handled series scripts, and Toshiya Kono designed the characters. Viz Media publishes the English version of the manga, which began serialization in Shogakukan's Monthly Big Comic Spirits in January 2021 and has released ten volumes as of December 2025. The manga has received praise from notable creators including Hideaki Anno, Hideo Kojima, and ONE.
Anime News Network reviews episode 12 of Snowball Earth, criticizing a late-stage flashback sequence that attempts to humanize Colonel Sagami. The review argues the redemption arc feels forced and illogical, contrasting it with protagonist Tetsuo's more reasonable desire for a peaceful life. A kaiju reveal provides some payoff but stretches the series.
Episode 11 of Snowball Earth attempts to give villain Sagami a sympathetic backstory involving parental abandonment, but the review argues the late reveal does not make him more complex. Tetsuo, however, gets a strong character moment by directly confronting Sagami and ultimately transferring his savior role to him.
Anime Feminist reviewed the premiere of Snowball Earth, a series about a socially awkward boy named Tetsuo Yabusame who pilots a sentient mecha named Yukio to fight intergalactic monsters. The episode opens years after Tetsuo befriends the mech in his father's lab, then follows him on a disastrous mission where his crew and Yukio are destroyed. He returns to Earth to find the planet entering a new ice age. The review praises the setup of humanity being overwhelmed by monsters but criticizes the tonal disconnect between the harsh war reality and Tetsuo's humorous social anxiety struggles. It notes that Tetsuo's genius-level piloting ability feels anticlimactic, and his social awkwardness is his only trait, making him a generic wish-fulfillment protagonist. The reviewer found the mystery of mechanical failures on Tetsuo's ship and the cause of the ice age more compelling than his personal growth. The animation is described as decent, though CG for Tetsuo and monsters is distracting. The review compares the series unfavorably to Dead Dead Demons Dededede Destruction for balancing personal and global stakes.
The latest two episodes of the anime series "Snowball Earth" advance the siege on the survivors' hideout, a school building repeatedly called the Mishima Mall. Episode 8 follows Sagami and his subordinates as they close in on the hideout, which is protected by a barrier built by Hagane's mother. The episode is described as well-paced and tense, though the CG animation for the kaiju is criticized as awkward, with one bat kaiju's movements compared to a CG child throwing a tantrum. A standout 2D shot of Ao atop her flaming chicken kaiju at the end of episode 8 is praised for its color and intensity. Episode 9 continues the fight but is criticized for cutting away from the airborne kaiju battle to focus on Sagami's backstory, which the review finds unconvincing. The reviewer argues that Sagami's plan-slaughtering those who do not side with him to become a savior-makes him a weak villain, and the flashback meant to generate sympathy instead makes the worldbuilding seem illogical. The fight scenes are described as stretched out and interrupted by flashbacks and dialogue, creating narrative dissonance. The review notes that the show's inconsistent animation choices make the CG look worse by comparison, as brief moments of 2D animation tease a higher quality the series does not maintain.
Video Research released the Japanese animation household TV ratings for the Kanto region covering the weeks of May 11-17 and May 18-24. In the first week, Sazae-san led with a 7.1 rating, followed by Detective Conan at 6.5 and Chibi Maruko-chan at 5.1. The top ten also included Doraemon, Crayon Shin-chan, One Piece, Star Detective Precure!, Curious George, Oshiri Tantei season 10, and Bluey. The following week, Sazae-san remained on top at 6.9, with Detective Conan at 6.2 and Chibi Maruko-chan at 4.7. One Piece rose to 2.7, while That Time I Got Reincarnated as a Slime season 3 and Ascendance of a Bookworm Part 3 re-entered the chart at 2.6 and 2.5 respectively. Demon Slayer: Kimetsu no Yaiba rebroadcast tied at 2.3 with Crayon Shin-chan. Star Detective Precure! closed the list at 2.0.
Episode 6 of Snowball Earth reveals that antagonist Sagami's villainous plans stem from jealousy of a young child, Tetsuo. His backstory and motivations are laid bare, framed as childish and insipid. The episode also features poor CG animation and a retreat by Sagami's squad that extends the conflict for the remaining six episodes.
Episode 7 of Snowball Earth focuses on a fight between Sagami and the trio of Tetsuo, Yukio, and Hagane. The choreography is fluid and well-paced, and a brief moment of tenderness with Yukio's handmade loveseat offers a welcome break from the show's usually serious tone. However, the episode's reliance on CG animation undercuts the impact of key action sequences, creating a jarring contrast with the detailed 2D close-ups.