Episode 1
Spring Begins
Along with three others, Natsu wakes up with no idea what's happened. The four of them reach an island and try...
Episode 2
Insects Awaken
Convinced that Botan has kidnapped them, Natsu and Arashi sneak out of camp and run into another survivor. Fin...
Episode 3
Light Snow
Natsu's clumsiness indirectly leads Team Summer B to the rest of their group. Her memories help them figure ou...
Episode 4
Autumn Begins
Arashi, Natsu and Semimaru stumble upon the Team Autumn settlement in the former Kobe region. They seem to be...
Episode 5
Heavy Snow
In the ruins of Tokyo, Natsu, Arashi and Semimaru meet the sole survivor of Team Winter. Team Spring reaches M...
Episode 6
Grain Rain
Aramaki joins Team Spring, despite Fujiko's doubts. Hana decides to search for Arashi after hearing that Arama...
Episode 7
Winter Solstice
Hana and her companions discover a massive underground shelter. They find a survivor’s diary and learn the cru...
Episode 8
Summer Solstice
Hana's group and the Team Autumn survivors find the Spring settlement destroyed and abandoned. Momotaro wakes...
Episode 9
Lesser Heat
To survive, Hana and the others work together with Team Summer A. On the ship, Hotaru's cousin Hibari tells Na...
Episode 10
Cold Dew
Ango recalls his harsh upbringing in the program and the brutal graduation test that winnowed the survivors do...
Episode 11
Greater Heat
Hana becomes convinced that Ango will kill her if she stays in the village. Natsu and the others make landfall...
Episode 12
End of Heat
Ryo orders Hana to join him in searching for a water source underground, putting her in a vulnerable position....
Episode 13
Frost Descends
Team Summer A banishes Ango and Ryo as Haru and the others mourn the missing Hana. Aramaki leaves the settleme...
Episode 14
Summer Begins
Expecting a trap, Ango and Ryo find and observe Team Summer B, but they are unexpectedly welcomed by the easyg...
Episode 15
Grain in Ear
The two newcomers help Team Summer B. As they get to know the group, Ryo doubts their ability to survive. Ango...
Episode 16
Autumnal Equinox
The carefree group enjoys life at sea, but Ryo tests their survival skills. Natsu reveals that Team Summer B i...
Episode 17
Vernal Equinox
Suspicious, Botan searches Ryo and Ango's belongings while the others look for Arashi. Elsewhere, another surv...
Episode 18
White Dew
Team Summer B gets stuck in a bed of dense algae. they find a large ship and investigate, but Botan is wary. S...
Episode 19
Winter Begins
The team members are separated after the ship's sudden movement. Arashi makes his way to help as Botan's group...
Episode 20
Lesser Cold
Ango's hallucinations lead to perilous situations for him and Arashi. Semimaru has a brush with death while Na...
Episode 21
Grain Full
A sanctuary in nature becomes a trap for small mammals and humans alike. Meanwhile, an iron-eating bacteria be...
Episode 22
Rain Water
Fujiko and Chisa reunite with Hana. On the ship, the missiles begin launch prep while Team Summer B learns abo...
Episode 23
Greater Cold
Hana readjusts to other humans. Team Summer B works together to manually disable the missiles, but a series of...
Episode 24
Pure Brightness
Problems persist in the ship as the spreading bacteria begins attacking. The missile countdown continues as th...