is a Japanese light novel series written by Rokujà «yon Okazawa and illustrated by Sage Joh. It was serialized online via the user-generated novel publishing website Shà Âsetsuka ni Narà  from November 2018 to July 2020. It was later acquired by Kodansha, who have published three volumes since August 2019 under their Kodansha Ranobe Books imprint.
A manga adaptation by Rurekuchie was serialized in Kodansha's manga magazine ' from August 2019 to April 2021, and transferred to ' in May 2021. It has been collected into 18 volumes as of March 2026. An anime television series adaptation produced by Encourage Films aired from January to March 2023.
Dariel is a non-magical soldier serving the demon army as an aide to the demon lord Bashvaza until he is fired by him. Having nowhere to go, Dariel sets out into the world when he saves a human girl Malika, and is invited to her village. When Malika got him registered into the Adventurer Guild, Dariel discovered that he is actually human with an extraordinary talent in swordsmanship compared to the Hero. While things become worse in the demon army due to Dariel's absence, Dariel gets used to life among humans but is conflicted with his demon upbringing, as humans and demon society have been at war for centuries.
Written by Rokujà «yon Okazawa, Chillin' in My 30s After Getting Fired from the Demon King's Army was published online via the Shà Âsetsuka ni Narà  website from November 15, 2018, to July 30, 2020. Kodansha acquired the series, and began publishing it with illustrations by Sage Joh on August 2, 2019, under their Kodansha Ranobe Books imprint. As of March 2020, three volumes have been published.
A manga adaptation by Rurekuchie began serialization in Kodansha's ' on August 6, 2019. The series moved to ' on May 20, 2021. As of March 2026, 18 volumes have been published.
Kodansha publishes the series in English on their K Manga service.
An anime television series adaptation was announced in July 2022. The series is produced by Encourage Films and directed by Fumitoshi Oizaki, with assistant direction by Yoshihide Yà «zumi, scripts written by , character designs handled by Satomi Yonezawa, and music composed by . It aired on January 7 to March 25, 2023, on Tokyo MX and other networks. The opening theme song is "Changemaker" by Hinano, while the ending theme song is "Dear Doze Days" by Akari Kità Â. Crunchyroll is streaming the series worldwide outside of Asia.