Ore ga Kokuhaku Sarete Kara, Ojou no Yousu ga Okashii.

Hoshine, the super high-spirited young lady of the Tendou family, has had feelings for Kageito, her servant, ever since she was a child. One day, she overhears another girl in her class confessing her feelings to Kageito! The moment she heard that… her attack on Kageito begins, using all of her skills (physical, intellectual, financial, and a woman's sixth sense).... A romantic comedy in which a young lady tries her best to master her servant!

(Source: Gangan Online, translated)