Kyudai Genso Academy is an institution designed for exceptionally gifted individuals with unique abilities, specifically trained to solve mysteries and tackle crimes often rooted in dark intentions. During their first semester, new students embark on their inaugural mission to compete for a place in the TOP 9, known as S・A, which stands for Special A. Each class offers specialized training tailored to the varied talents of the students. This Academy has been in existence for nearly 200 years. The current 101st generation of S・A has boldly chosen to defy the school's directives by entering the realm of Saranthania, home to 10th-level Yuma, who are regarded as the kings of demons. Their goal is to uncover the secret behind the elusive remaining 10%. However, they are unprepared for the repercussions that await them for revealing this hidden truth. What exactly does the remaining 10% of power entail? Can they solve this mystery?