The protagonist is a guy who ranks among the dumbest in his school. At this school, under teacher supervision, grades can transform into virtual entities to engage in battles! However, if you exit an exam midway, you receive zero points. A bright and cute girl named Mizuki Himeji had a high fever during her test. Despite her potential to be the second-highest scorer in the grade, she ended up with zero marks for leaving due to illness and was consequently relegated to the worst class, Class F.
Grades mean nearly everything. For Class A: They boast a sophisticated-looking teacher, a plasma TV as large as the entire wall serving as their blackboard, personal laptops, personal air-conditioners, refrigerators, adjustable seats, and all sorts of different gadgets. Inside the fridge, there are various drinks and snacks. Their ceiling is made of glass, and the walls allow them to display high-class paintings and plants.
As for Class F (the worst class): They have traditional Japanese desks and seat cushions. Their blackboard is filthy, and they don't even have chalk! Someone complains that the legs of his desk are broken, so the teacher asks,