On the very first day of junior high, Eren oversleeps and is woken up by Mikasa. While rushing to school, he runs into several of his classmates. When they arrive at school, everyone except Eren notices something is odd

Eren and Mikasa are sent to collect a club admission form from Armin, who has secluded himself at home all winter for fear of the cold. On the way, a Titan attempts to steal their gifts of food, but is defeated by Levi, who then steals Armin's futon. In an attempt to recover the futon, Eren and his classmates track down the Attack Junior High Scout Regiment, a secret, unapproved club

Annie is unable to admit her love of cheeseburgers at lunchtime due to the derision Eren received after admitting to the same thing; due to this, she develops a grudge and vows to defeat him in the next day's dodgeball match. However, when the match rolls around, Eren is late, causing Mikasa to be unable to devote herself to the game. After multiple rounds, only two teams are left: one with Jean, Mikasa, Armin, Sasha, and Connie; the other with Annie, Reiner, Bertold, Ymir, and Krista

Eren and the others are forced to join the Wall Cleanup Club since the Scout Regiment Club is an unapproved club. There, they are tasked with cleaning windows by Rico. Impressed by their work, she agrees to teach them how to use the club's secret equipment, the omni-directional mobility gear

Sasha and Conny both fail their tests and ask Armin for help. Conny promptly forgets about the study session, but Armin manages to help Sasha with math by using food metaphors. Meanwhile, Eren, Mikasa, and Jean are forced to listen to Oruo brag about his test scores

Jean finds a love letter in his locker and begins to fantasize about who it might be from. Annie approaches him in class, and a similar letter falls from her pocket, but she runs away before he can ask her about it. Later, they find her putting the letter in his locker; when Jean opens it, he finds a message asking him to meet at the park, and runs off

When Eren and his friends displease the upperclassmen, they are stuck with cleaning duty. Levi decides to teach them a lesson, challenging them to a contest in the Sports Day games in which the losing grade must clean the Titans' building. The next day, Sasha begins by losing the bread eating race to Hange when the latter uses her captive Titan, Sawney, to win

After the race of the last day, Hange and the other upperclassmen challenge Eren's class to a test of courage. That night they arrive at school, where Hange and Levi explain the rules: they must visit the art, music, and science rooms and write their names on the blackboard. The class splits into two groups and head out, encountering various ghostly apparitions said to be the "Seven Wonders of Attack Junior High"; there is a rumor that anyone who sees all seven will be cursed with misfortune

Bertholdt asks out Annie to the summer festival with Reiner, Christa, and Ymir. She is not interested but is forced to join in after her classmates all decide to go. On the rooftop, Reiner urges Bertholdt to tell Annie how he really feels about her

After a scandal, the president of the student council is ousted and an election is scheduled. Eren, Jean, Reiner, Oruo, Rico, and others all declare their intention of running. When they hear that Ilse Langnar, a member of the newspaper club, may have a notebook that contains the secret to winning the election, they pursue her in an attempt to procure it

Eren and his classmates decide to run a cheeseburger stand for the school festival. However, upon opening, they find that they have stiff competition from Rico and her kamameshi stand, the winners of the previous year's snack stand contest. Meanwhile, Jean and Marco end up putting on a performance of Snow White almost single-handed due to the rest of the class working at the cheeseburger stand

Following the events of the 104th school festival, Eren vows to get their cheeseburgers back from the Titans, defying the teachers and heading to the Titans' building. Finally making their way to the principal's office, where they believe the cheeseburgers to be located, they find a gigantic key in the center of a small city. As the rest of the class fights to hold off the attacking Titans, Eren carries the key to the keyhole and unlocks it