Ojou-sama, Chijoku no hate ni Warau. (2013)

Hajime had been Nanami’s loyal servant ever since her family took him and his younger sister Hana in after their parents passed away. Every day, he fends off the succession of men from noble families who come to propose to her. One day, Nanami came to their run-down apartment and asked him to teach her the life of the common people. At the same time, a fellow student at Tenshouin Academy, Otoha, asked for his advice in becoming an idol, and Nanami’s cool friend Touka also started acting weird. Then the daughter of the Naname group’s rival corporation, Shiaya, proposed to him all of a sudden. What will happen to him?