St. Luminous Mission High School

Kaihei leads a seemingly ordinary life as a high school student until he unexpectedly inherits the role of chairman at St. Luminous Mission High School, an all-girls institution previously overseen by his late grandfather. As the sole male presence on campus, he quickly finds himself grappling with the intricacies of managing school rules, events, and discipline, all while navigating the unique dynamics of the student body.

However, his new responsibilities take a darker turn when he learns that a student has mysteriously vanished. Determined to uncover the truth behind the disappearance without involving the authorities, Kaihei enlists the help of his closest friends. Together, they embark on a quest filled with intrigue and supernatural elements, striving to unravel the enigma before the school year concludes.