Fumizuki Academy is divided into classes ranked based purely on ability; Class A has laptops, reclining seats and ultimate comfort whereas Class F has to settle for a rundown classroom with rotten cushions and rickety coffee tables. Akihisa Yoshii has recently taken the placement exam and finds himself relegated to the lowly Class F along with many of his friends, and they’re far from impressed with their draughty facilities. Luckily, not all is lost as at Fumizuki, classes can declare war on each other to swap rooms by fighting with summoned characters whose strength is based on the users' test scores. As they dream of escaping their decrepit circumstances, the ‘idiotic’ students of Class F will try whatever they can to reach the dizzy heights of Class A’s luxury, even if it means taking on the entire school in an all-out summoning war!