Guest is the only son of a long-standing prestigious family, destined to inherit the household. Due to his family background, there is a risk to his personal safety, so he usually employs a private bodyguard. However, since the private Amagi Academy prohibits bringing outside security onto campus, he must utilize the school's unique "Special Student Protection System." The person designated by the school as his protector is none other than his personal bodyguard, Saku Kuon.

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Special Student Protection System A special system established at Amagi Academy for students requiring personal security. It targets students whose family background or social standing—such as children of political, financial, or noble families—puts them at risk. Since the school prohibits outside personnel from being stationed on campus as guards, the school selects a current student to serve as a "Protection Officer" for the student in question. The Protection Officer attends the same school as a regular student while monitoring and ensuring the safety of the target student.

Amagi Academy One of the nation's leading private high schools, attended by many children of prestigious families, political and business leaders, and influential figures in various fields. While it is a traditional school with a long history, it is equipped with the latest educational facilities and boasts high achievements in academics, sports, and the arts. The students' backgrounds vary widely, including those from ordinary families, but because there are many heirs to noble houses and major corporations, the campus has a unique sense of prestige and tension. School rules are strict, and outside personnel are prohibited from staying on campus. Therefore, the "Special Student Protection System" was established for students requiring personal security.