Born in different worlds, living in the same world Royal Cendrillon Academy. The protagonist, "Shunsuke Takita," enrolls in the Squire Department to fulfill a certain promise. The Squire Department includes extracurricular activities where students attend to the royal students, leading to various interactions with different princesses... On the day of the entrance ceremony, Shunsuke causes a problem and finds himself facing the risk of repeating a year in just six months. With the help of many people, including "Bernadette Henrietta Eiselston," with whom he once made a promise, "Henri=Francis La Bernard," a prince with a secret, "Orime Sasara," the daughter of a large corporation who speaks a mysterious language, and "Naomi Shirogama," a reserved classmate, Shunsuke strives to become a full-fledged squire. All for the sake of a single "promise."
