|Episode 4 «|| 図書館 / 廃工場 / 世界のはじまり
Library / Abandoned Factory / The Beginning of the World
|» Episode 6|
This episode is nicknamed Nemu's episode.
Rakka is working with Nemu at the library today, and meets Nemu's former sempai Sumika, who tells her that she once wanted to find out how Guri was founded (which she calls the "beginning of the world"). Meanwhile, Nemu reads a story to the young feathers. On their way home, Nemu and Rakka see Reki heading for the East District, and follow her unseen, to witness a quarrel between Reki and the haibane of the Abandoned Factory. On another day, Nemu tells Rakka about the present she planned for Sumika, and Rakka helps her finishing it.
The episode concludes with the story they wrote for Sumika.
For a more detailed summary, read about episode 5 on Sekai no Hajimari.