Title: 悪役令嬢の執事様 破滅フラグは俺が潰させていただきます | Akuyaku Reijou no Shitsuji-sama: Hametsu Flag wa Ore ga Tsubusasete Itadakimasu | The Butler for Villain Daughter (This is the text on the Japanese cover, for what that's worth... The thread title sums it up nicely.)
Author: 緋色の雨 | Hiironoame | Twitter | Narou
Illustrator: 村上ゆいち | Murakami, Yuichi | Twitter | Pixiv | Lit.link
Publisher: Kadokawa Dragon Novels Imprint
Bookwalker Series Page
MAL
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...
(Source: MAL (Shousetsuka ni Narou, translated))
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