At a prestigious high school known for raising the nation's best students, freshman Kiyotaka is assigned to Class D -- where the delinquents are kept.
Unable to accept her matriculation into a poor performing class, Suzune swears to change her class rank to an "A."
Everyone in Class D passes their midterm exams except Sudo. With his expulsion imminent, both Kiyotaka and Suzune take action to change his fate.
The students from Class C accuse Sudo of assault. Unless a witness comes forward to prove his innocence, his class's points are in jeopardy.
Sudo's claim of self-defense is at risk when Sakura, a key witness who can exonerate him, refuses to testify at the hearing.
Kiyotaka and Suzune work behind the scenes in hopes of a favorable verdict. Meanwhile, a mysterious man stalks Sakura inside the school.
Although Suzune continues to study alone during summer, she agrees to join her classmates at the pool when invited by Kiyotaka for reasons unknown.
The freshmen depart for a tropical island via luxury cruise. While Class D enjoys their trip, students in other classes look to further their agenda.
The students are in disbelief after being dropped off on a remote island, where their survival skills will be tested under strict rules.
The distraught students in Class D regroup as they work together to survive on the island. Meanwhile, Kiyotaka and Suzune spy on the other classes.
The students in Class D lose their solidarity as multiple incidents of sabotage within their basecamp pits the boys and girls against each other.
Kiyotaka gets Suzune to retire due to her declining health. Class D expects the worst outcome, but they’re surprised to hear their final score.
While enjoying summer break aboard a luxurious cruise ship, Kiyotaka and his fellow Class D students learn that they will undergo a new special test.
Suspicious of Karuizawa, Kiyotaka asks Suzune for information about her. Boasting that he'll figure out the test's logic, Ryuen makes Suzune an offer.
Seeing a distraught Karuizawa being relentlessly bullied by the girls from Class C causes Yukimura to intervene — and gives Kiyotaka an idea.
Preparations commence for the upcoming sports festival. With their academic results on the line, the students debate potential tactics.
On the day of the sports festival, the red team gets off to a strong start thanks to Sudo and Suzune, but the white team begins targeting them both.
Suzune tries convincing an angry Sudo to come back to the sports festival with her and continue competing. Kiyotaka accuses Kushida of treachery.
After the students of Class D learn how they performed on the midterm exam, Ms. Chabashira announces an upcoming test they will undergo in pairs.
Class D decides to hold study sessions to prepare for the upcoming Paper Shuffle exam. Later, Suzune makes a high-stakes bet with Kushida.
The students in Kiyotaka's study session agree to form a group. Later, Kushida submits the questions for Class D, along with a special request.
Kiyotaka learns that a student from Class A has been watching his study group. After returning a book to the library, he meets with a familiar face.
A crowd of curious students gathers around Ryuen as he accuses Koenji of being the person from Class D who has been interfering in his plans.
Ryuen continues to harass Karuizawa, but no matter how much he torments her, she defiantly refuses to reveal Kiyotaka’s identity as the mastermind.
Sato asks Karuizawa for advice about her upcoming Christmas date with Kiyotaka. Suzune declines Kiyotaka's suggestion to join the student council.
Now promoted to Class C, Kiyotaka and his friends head into the mountains for a mixed training camp — where expulsion from school is a real threat.
Kiyotaka presses a second-year student for information regarding Nagumo. Later, he spots Hashimoto and Ryuen holding a secret midnight meeting.
News of Karuizawa and Hirata breaking up becomes a hot topic around the school. Suzune informs Kiyotaka of unsettling rumors surrounding Ichinose.
On Valentine's Day, Kiyotaka asks Karuizawa to meet up after school. A student from Class A secretly observes their conversation and approaches them.
Hashimoto is accused of spreading the rumors. When Sakayanagi claims to have proof of Ichinose's deeds, Ichinose opens up about her past.
The Class C students are relieved to learn they have passed the end-of-year exam, but their joy is short-lived as Ms. Chabashira announces a new test.
Kiyotaka learns that Ichinose has asked Nagumo for help with the next exam. Later, he and Suzune realize the mood in their class has oddly shifted.
Upon hearing Suzune's damning accusations, Class C seems ready to expel Yamauchi — but Hirata strongly objects, throwing the class into confusion.
After Kiyotaka and Sakayanagi encounter a menacing man who claims to be the school's new acting director, they agree to compete in the next exam.
Class C strategizes for the upcoming exam, but Hirata refuses to cooperate and rebuffs a concerned Mii. Kiyotaka confronts him about his attitude.
Sakayanagi and Kiyotaka's classes go head to head in the special exam, culminating in a hotly contested chess match between Suzune and Hashimoto.
Despite being demoted, Suzune and her classmates are praised for their efforts. Kiyotaka seeks allies to help put a stop to Tsukishiro's machinations.
As spring break begins, Kiyotaka asks Hiyori to relay a message to Ryuen. Later, Kanzaki intrudes on a secret meeting between Ryuen and Hashimoto.