Tie has passed since the death of Lucy/Nyu. Nozomi, who has recovered long enough to speak again, comments to Yuka that it definitely is spring, while Mayu urges Nana to be careful as she re-tiles the roof, almost not reacting to her arm falling off. Yuka proclaims the newly repaired Maple House to be ready to welcome home Kouta.
Kouta then begins a narrative of events in the world. Four months after Lucy's death, the World Health Organization forbade any human births due to the outbreak of births of horned children who would kill Humans as they grew older. Arakawa developed the vaccine needed to prevent these births but seemed unhappy with the fame and recognition she once craved so badly. Between the people killed by the horned children, and the lack of new human births, humankind faced extinction before the widespread inoculations of the vaccine, but once they were in place, the birth ban would be lifted soon, albeit with Earth's population decreased by a large number for some time to come.