All students go to the cruise. Chabashira informs Kiyotaka that somebody requested his expulsion. If he don't help others to promote to A class she will use first opportunity to expel him.

As part of a special test, the school has brought the students to an uninhabited tropical island where they must now live for a week. Their performance on the test can have an enormous impact on the point standings of the four classes.

Class D has achieved a degree of unity in facing the special test, so Ayanokouji and Horikita head out to see how the other classes are getting along. Class B is working together to make a comfortable life for themselves, while Class A remains secretive.

Survival test is coming to the end. Things don't look well for 1-D. Key card is stolen. And now Suzune is forced to withdraw due to her sickness. Kiyotaka will try to turn things around.

Ayanokoji's class embarks on their first trial as the ascended Class C, the mixed training camp.

Yukimura injures his leg while the group is training for the upcoming tests. He later devises a plan for how the group should handle the marathon and then the day of the four tests arrives.

While Class C are discussing Karuizawa and Hirata's break up Yamauchi is approached by Sakayanagi from Class A. Horikita warns that it's a trap, but Yamauchi pays it no heed. Meanwhile, Horikita tells Ayanokoji that rumors are swirling around Ichinose.

After conversing with her brother Manabu, Horikita offers Yamauchi name as the one who should be expelled. Not only has he made few contributions to the class, but he also worked with Sakayanagi in Class A to expel Ayanokoji.