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Hana's group and the Team Autumn survivors find the Spring settlement destroyed and abandoned. Momotaro wakes up among strangers.
Hana and her companions discover a massive underground shelter. They find a survivor's diary and learn the cruel fate of those who took refuge there.
To survive, Hana and the others work together with Team Summer A. On the ship, Hotaru's cousin Hibari tells Natsu that Hotaru is slowly dying.
A shy girl named Natsu learns that she's part of a group chosen to ensure the survival of humanity. Together, they have to survive on a changed Earth.