Life back on the cruise following the Island Special Examination is anything but smooth sailing. Almost immediately after their return, the first-year students of Tokyo Metropolitan Advanced Nurturing High School face yet another special exam, with both class and individual points on the line. In addition to the complicated ruleset, more issues arise in the form of Kakeru Ryuuen and Kei Karuizawa. Angered by the previous test's outcome, Ryuuen is dead set on outdoing every class in the new challenge using any means necessary. Meanwhile, Karuizawa, a crucial pillar of Class D, is close to crumbling under the pressure of her past. The stage is now set for Kiyotaka Ayanokouji to once again—using the full extent of his planning, foresight, and ruthless manipulation—steer Class D to victory as dangerously close enemy forces try to bring it down.

With the start of the third term, Ayanokouji and his classmates, who have been promoted from Class D to Class C, head off for school camp. They will take part in a special test called "Mixed Training Camp," where all grades are combined. As the name implies, the test is divided by gender, and several groups are made up of mixed classes and graded based on a group basis. They have to cooperate with students from classes with whom they had been competing against each other as enemies to obtain a high score. Above all, they are horrified by the rule that students from groups that fail to reach the borderline will be expelled. The curtain on the turbulent third semester of the school year is about to rise!

As Ayanokouji and his classmates begin their second year at the Advanced Nurturing High School, they're greeted by a fresh gauntlet of exams and a fresh batch of rather unique first-year students. They'll have to get to know each other quickly, because the first special exam pairs the first-years with the second-years on a written test—with only the second-years facing expulsion if their team performs poorly! Worse yet? It seems one of the new first-years is also from the White Room. Can Ayanokouji avoid expulsion while sussing out the identity of this hidden foe?