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The characters receive an email from Ovan requesting them to go to Δ Hidden Forbidden Festival, where a mysterious summer festival is set up. There they encounter an AIDA who wishes to peacefully co-exist with the players of The World. It then shows the word "Returner", which Haseo assumes it means that Ovan will return to The World. At the end of the episode, Ovan is reunited with Ina.
These characters are all given speaking roles (in order of appearance):
Aside from these characters, a vast number of characters from both GU and Roots made cameo appearances during the festival.
In Japan, DVDs of Returner were shipped to fans who bought all three games, just as GIFT was. Returner is not yet available in America.