Chabashira explains how the system works at this school. The four first-year classes are all ranked by merit, and class D has the opportunity to be promoted to class C with strong performances on exams. She also warns that with the current situation, anybody who fails one more exam will be expelled. Now fully aware of the system, everybody takes their studies more seriously except for the three biggest idiots of the class: Ken Sudo, Kenji Ike, and Haruki Yamauchi...