Regaining the memories of his previous life, Cyril realised that he was an otome game's character, the villainous daughter Sophia's butler. At the rate things were going, Sophia would eventually have the prince stolen away from her by the heroine, fall into darkness, and be executed. Wanting to save the villainous daughter he was so fond of, Cyril moved to eliminate all the factors that would cause her to fall into darkness, raising her up to be a talented and beautiful girl who could win the prince's love, however...

Akuyaku Reijou no Shitsuji-sama: Hametsu Flag wa Ore ga Tsubusasete Itadakimasu began as a web novel on Shousetsuka ni Narou under the title Akuyaku Reijou no Shitsuji-sama: Ore ga Sodateta Kanojo wa Totemo Kawaii on July 31, 2019. Kadokawa has released revised and illustrated version of the series since April 3, 2020 under its Dragon Novels label.