Students of the prestigious Tokyo Metropolitan Advanced Nurturing High School are given remarkable freedom—if they can win, barter, or save enough points to work their way up the ranks! For summer break, the first-years are sent on a luxury cruise to a remote tropical island. And as the students learn, it's yet another of the school's bizarre tests. All four classes will spend a week competing against each other for resources, and the results could drastically change their rankings. Class D has nothing to lose and everything to gain, but if they want to win, they'll have to work together—and stay one step ahead of their opportunistic rivals!