Rich Girl Caretaker: I’m Secretly the Caregiver of the Most Popular Girl in This Rich Kid School

A poor high school boy, Itsuki Tomonari, got caught up in a kidnapping attempt on Hinako Konohana, a young lady from one of Japan's largest conglomerates. On the surface, Hinako appears to be a brilliant and beautiful young woman, but in reality, she is a lazy girl with no life skills. However, due to family reasons, Hinako has to play the role of the "perfect young lady" at school. Wanting to protect her, Itsuki took on the job of caring for her. Eventually, Hinako began to spoil Itsuki with all her might -- "I don't want...... Itsuki to leave my side right now." This is a love story that begins beyond the master-servant relationship featuring a princess with a beautiful facade.

(Source: HJ Bunko, translated)