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

High school student Itsuki Tomonari leads a modest life, trying to avoid unnecessary trouble and focusing on his studies, until a chance situation leads him to rescue Hinako Konohana during an incident that threatens her safety. It later turns out that she is the heiress to an influential conglomerate, surrounded by attention and strict rules of public conduct. In everyday life, however, Hinako proves unable to handle the most basic tasks, including cooking, organizing her schedule and taking care of household chores.

The family's leadership decides to appoint Itsuki as her personal attendant, taking into account his reliability and his ability to react quickly in unusual situations. He has to accompany her at school, at home and at events, heading off the consequences of her careless actions. Along the way he runs into constant surprises, including ruined lessons, accidental mishaps and conflicts with the people around them. Hinako gradually begins to rely on him when making decisions, turning to him for advice in situations that call for common sense.