Rock and Yamato suddenly become violent after returning from Building 5 and attack Jyugo and Seitarou. Covered in bruises, Jyugo tries his best to protect Uno and Nico. Tsukumo, who has been training in Building 5 with Rock, appears. Hajime knocks out Yamato and realizes a familiar yellow talisman on the nape of Yamato’s neck.

Yamato takes Rock and Tsukumo to Building 5 for training. Rock challenges Samon to a duel, but he is defeated by only one finger. The warden gathers all the supervising officers before she leaves for her business trip. Nimaijita, the deputy supervisor of Building 2, blames Samon that Nanba Prison’s reputation is ruined because of what happened in Building 5 in the past. Unable to take it any longer, Samon leaves the room. This is because someone important to Samon is related to this incident.

A new guard has come to Building 13. It’s Hajime Sugoroku’s brother(?), Hitoshi Sugoroku. This takes Hajime by surprise and he tries to lecture Hitoshi to go home, but he has already been hired. Meanwhile, Uno and Rock starts doubting Hitoshi, who can pull off a woman’s guard clothes nicely, is actually a gorilla’s... or Hajime’s brother. To find out the truth, the 2 announce the beginning of Cell 13’s customary game of tag.

Jyugo escapes from prison again and Hajime Sugoroku goes looking for him again. Uno, Nico, and Rock are having a good time in Building 13. It’s a usual day for the inmates and guards. Many things have happened, but it seems like nothing has changed in Nanba Prison. But don’t let your guard down! Mitsuru Hitokoe, sensing a disturbance in the air, goes spying on each building believing something will happen.

A man name Elf suddenly appears in front of Jyugo. Elf has connection with the man with the scar on his neck and has been looking for the specimen, Jyugo. Elf conveys that he will harm the people around Jyugo and disappears. Jyugo fears that something bad might happen to his friends if he stays, so he decides to escape from Nanba Prison alone.

Kenshirou visits Musashi in Building 4’s underground cell to ask about his past. Building 13 invites Musashi to come visit. Uno shows Musashi his new game room. All the inmates and guards who fought in the New Year’s Tournament gather in the game room. They enjoy each other’s company putting their animosity behind them. That night, Jyugo can’t sleep still excited from the day’s events. He escapes the cell alone and encounters a certain person...

Building 13 Cell 13 has won the New Year’s Tournament. Rock receives a stone oven and Nico receives the latest video game everyone can play with. Rock and Nico invites inmates from other cells to show their prizes. The two are very satisfied and they both thank Jyugo for that.

Hajime has been given a three-day suspension due to beating Jyugo at the New Year’s Tournament. Momoko orders Kenshirou, Kiji, and Samon to take turns covering for Hajime. But Uno, Nico, and Rock do whatever they want as usual. The three supervisors constantly struggle to maintain order with the three troublemakers. Finally, after three days, Jyugo is back...

This is “Nanba Prison,” the large impregnable prison somewhere in the territorial waters of Japan. On this night, 4 inmates recklessly attempt to escape from the world’s best prison guards and security. Jyugo, who wears mysterious shackles. Uno, a self-proclaimed ladies’ man. Niko, an otaku who’s prone to illness.Rock, a foodie gang member. Can the inmates of Building 13, Cell 13 pass security and reach outside of prison in one piece?

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.

It's summer vacation! The first-years get to board a luxury cruise ship, where they're allowed to sample the highest class facilities available.

Even during summer vacation, lone wolf Horikita would rather remain locked in her room studying than interacting with others. One day, Ayanokoji invites her to visit the pool with some of the others.

Sakura's testimony has bought Class D time, but Horikita and Ayanokoji still need to find a way to tilt things in their favor. Meanwhile, Sakura senses the presence of a strange man nearby.

With the hearing for the assault approaching, Ayanokoji and Kushida attempt to secure the cooperation of Sakura Airi, possibly the only person who can testify that Sudo was acting in self defense.

Sudo has been accused of fighting with a student from Class C, and depending on an upcoming ruling, Class D might have its few remaining points stripped away.

Thanks to a lot of hard work and scheming, Class D managed to get surprisingly high scores on their midterm exam. But when a student fails a single test, Ayanokoji makes one final play to save his classmate from expulsion.

With their first midterm exam approaching, Class D needs to find a way to improve their class average, or face another month with no points to spend. Even Horikita decides to take part, forming a study group to help the class underachievers. But can the stanoffish Horikita really inspire her classmates to succeed?

Ibuki has stolen the key card, and Horikita's condition has deteriorated. Over Horikita's objections, Ayanokoji forces her to drop out.

With the panty thief incident already eroding Class D's trust, Horikita finds her leader key card stolen. While they try to figure out who did it, the base camp is thrown into chaos with a new incident of arson.

Class D has achieved a degree of unity in facing the special test, so Ayanokoji 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.