Since I Was Confessed To, Milady Has Been Acting Strange

Hoshine, the elite young lady of the Tendou family, has long harbored feelings for Eito, the servant who has been by her side since childhood. When she discovers that a classmate has confessed to Eito, Hoshine doesn’t hesitate! She decides to pour all of her intellect, strength, wealth, and (questionable) intuition into winning his heart. See the surprising lengths she will go for love in this chaotic lady-and-butler rom-com!

(Source: Manga UP!)