Royal Sand Lyon Academy. The main character, Shunsuke Takida, entered the retinue department in order to fulfill a certain promise. In the retinue department, there is an extracurricular activity to accompany and take care of the students of the royal department, and take care of various princesses .... Shunsuke, who had a problem on the day of the entrance ceremony, was in danger of repeating a grade in just half a year. With the help of many, Shunsuke aims to become a full-fledged servant.