The science lessons are short "omake" bonus features originally present on the first two volumes. Each short lasts around two minutes, and stars super deformed versions of Noriko, Kazumi and the Coach explaining the various scientific aspects of the series. (Source: Wikipedia)

Wall Sina, Goodbye Annie Leonhart has a job to do—and a resulting absence that must stay off her record at all costs. With no one else to turn to, she asks her comrade Hitch Dreyse to cover for her. She agrees but puts forward a single condition: Annie must solve the fruitless missing person case Hitch was assigned. The case revolves around Carly Stratmann, a university graduate and the daughter of wealthy businessman Elliot Stratmann. With only a single day to solve the case and the underground of the Stohess District crawling with thugs, Annie must put her all into finding this girl. Yet, every answer she uncovers only leads to further questions—how has the illegal drug coderoin found its way to Stohess, what is Elliot hiding, and where has Carly disappeared to? Lost in the Cruel World With worry for Eren Yeager gripping her heart, Mikasa Ackerman begins to remember. She remembers her conversations with Armin Arlert, her concern for her friends, and most painfully, the time she had almost lost everything. As fear takes control, she begins to experience an alternate version of her past—some things can be changed, but are there events so inescapable that she can't even prevent them in her dreams? [Written by MAL Rewrite]

Fumiya Tomozaki is Japan's best player in the online game Attack Families, commonly known as "Tackfam." Despite holding such a revered title, a lack of social skills and amiability causes him to fall short in his everyday high school life. Failing to have any friends, he blames the convoluted mechanics and unfair rules of life, forcing him to give up and proclaim himself a bottom-tier character in this "game." After a fateful meeting with another top-tier Tackfam player, Fumiya is shocked to discover the player's true identity—Aoi Hinami, a popular, smart, and sociable classmate who is the complete opposite of himself. Aoi, surprised at how inept Fumiya is at everything besides Tackfam, decides to assist him in succeeding in what she calls the greatest game of them all. Through the gruesome ordeals of social interactions and relationships, Fumiya begins to advance tiers in the glorious game of life. [Written by MAL Rewrite]

Ilse no Techou: Aru Chousa Heidanin no Shuki During the Survey Corps' 49th recon mission, Hange Zoë is determined to capture a titan specimen. Despite not receiving clearance from Commander Erwin Smith, when a titan is spotted in nearby forestland, Hange rides out alone to meet it. Recklessly luring it out, she asks the titan numerous questions and puts her life on the line for the sake of her research. However, the behavior of this particular titan is far from normal. It quickly turns back and enters the wood once again, leading Hange to somewhere specific. What Hange finds is the legacy of former scout Ilse Langnar. In spite of her death, she provides a valuable piece of information that may serve to turn the tide for titan research—a diary documenting her last moments. Totsuzen no Raihousha: Sainamareru Seishun no Noroi Jean Kirstein would do anything to escape his boring home life and overbearing mother. After enlisting in the military, it became his ultimate goal to join the Military Police regiment and live out in peace and luxury. However, during his time with the 104th Training Corps, things never really go the way Jean wants them to. Eventually, the stolen glory and condescending banter of his comrades become too much—and Jean challenges fellow cadet Sasha Blouse to a battle, in order to determine which of them is strongest—but who will come out on top? Konnan The 104th Training Corps' most recent mission is a trek on horseback into the forest. Although a test of their ability to stay alert even in non-threatening situations, the task is boring and can lead to in-fighting. This is especially true for one of the groups, lead by Marco Bott. Some want to stay true to the mission they have been tasked with, and the rest would rather slack off, occupying themselves with more exciting activities. But when trouble strikes, they are completely unprepared. [Written by MAL Rewrite]