Maids Can't Kill Tonight

Koyoi has lived her entire life as an assassin. Her next target is a young man who lives in a large mansion with his butler. She thought she could easily fulfill her objective by infiltrating as a maid, but the master is a creature Koyoi has never seen before, a trashy womanizer! What will be the fate of the two who target each other as prey?!

(Source: Kodansha, translated)