After returning from the Island Special Examination, life on the cruise for Tokyo Metropolitan Advanced Nurturing High School's first-year students is anything but smooth sailing. Immediately following their return, they face yet another special exam with both class and individual points at stake. The complicated ruleset of this new challenge are further compounded by issues arising from Kakeru Ryuuen and Kei Karuizawa.
Ryuuen, still angry over the outcome of the previous tests, is determined to outdo every class in the new challenge using any means necessary. Meanwhile, Karuizawa, a crucial member of Class D, is struggling under the pressure of her past. The stage is now set for Kiyotaka Ayanokouji to once again use his extensive planning, foresight, and ruthless manipulation to steer Class D to victory as enemy forces close in on them.