The official Twitter account for the anime adaptation of Yoshitoki Ōima's manga "To Your Eternity" has confirmed that the show will be returning for a third season. The upcoming season will continue the story with the "This World" arc, following Fushi's ongoing journey. The announcement was made on Sunday, after the airing of the 20th and final episode of the second season in Japan.

The second season premiered on NHK Educational in October 2021 and was streamed worldwide (excluding Asia) by Crunchyroll, along with an English dub. The first season, which was originally slated for October 2020, had been postponed due to COVID-19, and finally premiered in April 2021. The anime was also streamed by Crunchyroll.

The manga, which began serialization in November 2016 in Weekly Shōnen Magazine, is published in English by Kodansha USA Publishing. The story follows a lonely boy in the Arctic who befriends a wolf as they both struggle to survive the harsh environment. However, both characters have secrets that gradually come to light as the story unfolds. The manga won the Best Shōnen Manga award at the 43rd annual Kodansha Manga Awards and was also listed as one of the Great Graphic Novels for Teens by the American Library Association's Young Adult Library Services Association.

Crunchyroll also streams the manga in English, digitally and simultaneously with its Japanese release. The second arc of the manga was concluded in October 2022, and the third arc began in January 2023.