|Episode 5 «|| 夏の終わり / 雨 / 喪失
End of Summer / Rain / Loss
|» Episode 7|
Rakka searches for a room of her own in Old Home, and is helped by Kuu, who also gives her a coat for the upcoming winter. When Rakka takes a break, Kana finally manages to get the Old Home clock tower bell to ring, and tells Rakka about Kuu's past. Rakka then chooses to move into her cocoon room, as Kuu suggested. Kuu comes to thank Rakka and runs off, leaving Rakka confused. A storm comes up and Rakka sees a light coming from the Western Woods. Reki and the others are very worried, and it really turns out that Kuu has taken her Day of Flight. The haibane of Old home go together into the woods to collect Kuu's halo from the altar and leave it on a shrine.
For a more detailed summary, read about episode 6 on Sekai no Hajimari.