Cang-shu and Cui-xin prepare to play a round of "outward bound," a game in which students from different classes compete against one another in a series of physical contests. The first round is won by class one, and the second round by class two. The third round is mixed gender basketball, the fourth round by badminton, the fifth round by "wire walking on water," and the sixth round by a team-building exercise. The two students are determined to be the first class to win the game and to prove that they are the best in the world.