Bí mật của Idol, sau giờ học

"In my class, there is a true idol." A first-year high school student at an ultra-elite school, Hiruno has to be the top student in his class according to his strict mother's order, but when he fails to fill in his first achievement test, he gets a red mark and has to take a remedial class. However, there is another participant in the remedial class...?