Сакамото Юджі

Yuuji Sakamoto is the class representative of class F. In the series, the class rep position is assigned to the smartest student of that class. He is cool, collected, and exhibit surprisingly high intelligence and foresight unexpected of a student from class F. In volume 1, his strategies and tactics had helped class F to attain victory after victory, until the duels with class A in which he overestimated his ability in elementary school level Japanese history. Yuuji was once known as a child prodigy in his childhood. The only reason why he ended up in class F was because he did not study at all and he holds the strong belief that grades are not everything.

However, due to the consequences he 'suffered' from his defeat from Shouko Kirishima, his childhood friend and also the top student of his level, he became motivated to study again, and in the later volumes, his Shoukanjuu became reasonably strong in just a few months due to his test scores improving by leaps and bounds. It is implied that he is actually smarter than his childhood friend, Shouko. After the tournament in volume 2, he acquired a platinum bracelet which allows him to control the size of the force field of his Shoukanjuu, allowing him to form a one-man army choke point since humans cannot pass through this force field.