Episode 20

"Echos" (残響, Zankyō) is the twentieth episode of To Your Eternity, and the finale of the first season. It is followed by the upcoming premiere of its second season.

Synopsis
Fushi says goodbye to Tonari and returns to the port of Zedan, where Pioran awaits. However, his existence, which further attracts the Nokkers, poses a danger to Pioran. It appears that it is still not time for reunion, but...

Summary
In an inn at the port near Jananda Island, Pioran is enjoying a dish of beans when the waiter asks of the friend she has been waiting to come. From outside one of the windows, Fushi, in the form of the Arctic wolf Joaan, watches sadly. He thinks to himself how separating from his old companion would keep her safe from the strong and restless Nokkers, as it is him that they seek to destroy. He returns to his default human teenage form, and makes the choice to distance himself from the elderly woman, but assure her of his wellbeing in the form of a letter by creating one and a quill pen he borrowed from an unsuspecting boy.

Elsewhere, a kind man enters his home hut on a beach, only be attacked by the very person he had saved who extends its unusually powerful right arm and drags him inside, presumably kills him, which shows that she has merged with the Nokker that had brutally attacked her.

As weeks turn into months, Pioran gradually shows signs of dementia, which the Beholder had forewarned Fushi of, but still does whatever he can to care for her. One day, the dying Pioran speaks to the Beholder and asks him to enable herself ("fye") be reborn as something that will help Fushi on his everlasting journey. As she enters Paradise, the Beholder takes a hold her vital essence through a white orb that looks similar to Fushi's true form. Fushi finds Pioran's lifeless body and mourns his lifelong friend and cherished companion; admitting just how happy he had been with her. Several decades later, a middle-aged Fushi laughs crazily as he has just overpowered and killed another pursing Nokker that was attacking him.

Anime Differences

 * Pioran had told Fushi that she was blessed with one child and grandchild, as opposed to several in the manga.

Trivia

 * The title is the same as the finale of the French 2D/3D animated show Code Lyoko, and a 2022 Netflix miniseries.
 * Hayase makes her final physical appearance, albeit as a cameo with only her right arm being seen, after she is saved (off screen) by a good-natured man on the beach. It is possible she ruthlessly raped and executed him using her Nokker-fused arm, or that she used him to grant her the child that would become the unnamed mother of nine-year-old Hisame four decades later.