Maids Can't Kill Tonight

Koyoi, who has lived her entire life as an assassin, is assigned to kill a young master who lives in a large mansion with his butler. She thought she could easily complete the mission by infiltrating as a maid, but.... Her target is a type of man Koyoi has never met before, a "trashy womanizer!" What happens when the two target each other as their prey…? (Source: Kodansha, translated)