This is a special mission of where you sent your girls to support the students in their daily activities. You'll form at least 8 cards with the 9th being belong to a friend etc.
The gameplay is similar to rock-paper-scissors. Hitting the weak stat does more damage while in reverse does little.
Hence Pop -> Sweet -> Cool -> Pop
There are 2 types in this. One is a regular study scenario that all players will went, as progress goes the target girls gets more and more durable and require stronger cards.
Another one is unlockable on Level 60, this rewards rings and face single stat girls which players must bring also a strong, single stat group.