The story takes place in the College of Saint Girls, a super aristocratic girls' school. the people who live and study here are all noble-born girls, and there is no doubt that their manners are graceful, and it is absolutely impossible to make any faux pas that violate their identity. the civilians who admire them call them "archangel girls". From an early age, Cheng Shixu lived a normal life with his mother. However, one day, the only thing the city Shixu relied on died suddenly. In desperation, the city Shixu can only come to the elder brother Yichi (Yi Shigu Youjie) who has never met before, who knows that his brother, who is an aristocrat, and himself are simply not from the same world. In this way, Cheng Shixu became a transfer student at the Saints' College. From the civilian society, she had to learn all kinds of red tape that only belonged to the princes and aristocrats in a short time. In addition, she has to face a series of accidents on campus.