Uchi no Ojou-sama ga Hametsu End shika nai Akuyaku Reijou no you na no de, Ore ga Kyuusei shitai to Omoimasu

I, Vincent, a butler of a count’s daughter, suddenly remembered that the world I'm currently living in is part of an Otome game I’ve played in my past life! On top of that, my beloved lady is the villainess who will end up dying a violent death…?! What the hell! I’ll DEFINITELY save my lady from her bad endings!!! A peppy, isekai comedy, where the butler, Vincent “I Love My Lady” Serenade (a love interest), sprints around snapping all of his dear villainess’ death flags.

(Source: Manga UP! Global)