Kiyotaka Ayanokoji and his classmates have finally advanced to Class C, but a tumultuous third term lies ahead. They face an exam known as the “mixed training camp,” a co-ed test in which all classes must work together to achieve high scores. Not only are students forced into unpredictable groups with former enemies, but those who fail to reach the benchmark will be expelled!

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.

It's Valentine's Day and the boys of Class C are excited about whether or not they will receive chocolates. Meanwhile, Karuizawa seems uneasy over Ayanokoji's request to meet up and while doing so an unexpected person appears...

Turns out the one spreading the rumors was Hashimoto, who did so at the behest of Sakayanagi. Shortly thereafter, Sakayanagi appears before Class C and she informs them she has evidence regarding the rumors about Ichinose.

Everyone in Class C has passed their year-end exam. While relief flows through the classroom, Chabashira announces a special exam. It will be a class vote to choose three people worthy of praise and three worthy of censure.

With the approaching class vote, a disturbing atmosphere hangs over Class C and fills them with suspicion. Second-year Class A's Asahina informs Ayanokoji that Ichinose has asked for cooperation from student council president Nagumo.

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.

The class vote has seen the first student expelled from Class C. Sakayanagi meets up with Ayanokoji and they're approached by a man named Tsukishiro sent by Ayanokoji's father. Afterward Ayanokoji challenges Sakayanagi to compete on their next exam.

Class C considers various strategies for the special exam, but they all lack a decisive factor. Hirata remains disappointed in the class vote result. Ayanokoji calls out to Hirata, who acts coldly towards Mii-chan who is worried about him.

As Hirata recovers and the class shows unity, it's finally Ayanokoji vs. Sakayanagi. The final special exam has begun and the first round is basketball. Class C puts up a good fight, but Sakayanagi plans to mentally shake Sudo so he will fall.

The class narrowly lost to Class A in the final exam, and were demoted back to Class D. However, the students showed growth throughout the year. Horikita, in particular, having grown as leader requests to dissolve the alliance with Class B.

It's spring break. Shiina calls Ayanokoji to discuss books. Meanwhile, Class B's Kanzaki appears before Ryuen, who is having a secret meeting with Hashimoto. Although the class was defeated, Kanzaki faces Ryuen without hesitation.