Classroom of the Elite (Manga) Vol. 5 (manga)

Students of the prestigious Tokyo Metropolitan Advanced Nurturing High School are given remarkable freedom - if they can win, barter, or save enough points to work their way up the ranks! The school's special exam is still taking place on an uninhabited island, and Class D is making the most of their limited resources. Ayanokouji is certain they might pass the test with points to spare. Then, one of the girls' underwear goes missing, and the class quickly divides itself, causing chaos.

Somehow, Ayanokouji is tasked with finding the thief. He doesn't want to believe any of the other Class D boys could be responsible, but if it's someone from another class, that means Class D is being targeted!