Akashi Eito, a student who flunks his high school entrance exams, unexpectedly receives an acceptance letter from a mysterious school he never applied to. Enrolling with hopes of a typical school life, his dreams shatter when he learns it's a covert agent training ground. Initially wanting to flee to his ordinary life, Eito's perspective shifts when the school's director unveils his father's secret agent past. Intrigued by his father's legacy, Eito stays to uncover the truth. Amidst facing a perilous initiation exam, Eito, lacking physical prowess, showcases immense courage and bonds with others through bravery and friendship in this thrilling tale of espionage and valor.