Chillin' in My 30s After Getting Fired from the Demon King's Army (Japanese: 解雇された暗黒兵士(30代)のスローなセカンドライフ, Hepburn: Kaiko Sareta Ankoku Heishi (Sanjū-dai) no Surō na Sekando Raifu, lit. "The Slow Second Life of the Retired Dark Soldier in His 30s") is a Japanese light novel series written by Rokujūyon Okazawa and illustrated by Sage Joh. It was serialized online via the user-generated novel publishing website Shōsetsuka ni Narō 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.