The third story arc of the Attack on Titan manga, spanning chapters 15 through 18 in volume 4. Shaken by the devastation the Titans left behind, Eren, Mikasa, and Armin commit to military service, joining the 104th Training Corps and learning alongside its recruits how punishing a soldier's path can be.
This arc holds third position in the manga's story sequence, bridging the Wall Sealing arc and The Female Titan arc. Its four chapters, numbered 15 through 18, were collected in volume 4 and serialized over four months, from November 9, 2010 to February 9, 2011. The name is a fan designation rather than an official label.
Scarred by what the Titans did to their home, Eren Yeager, Mikasa Ackerman, and Armin Arlert choose a military life and sign on with the 104th Training Corps. The chapters trace their days among the other recruits as friendships take shape and the true weight of soldiering starts to sink in.
The four installments are One by One, Necessity, Delusions of Strength, and What Should I Do Now?.

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The 104th Training Corps arc is the third story arc of the Attack on Titan manga, spanning chapters 15 through 18 in volume 4. It follows Eren Yeager, Mikasa Ackerman, and Armin Arlert as they enlist in the 104th Training Corps after witnessing the Titans' devastation of their home.
Yes, the 104th Training Corps arc covers this period of the story. Serialized from November 2010 to February 2011, it follows Eren, Mikasa, and Armin through their early days of military training as they learn how demanding a soldier's path can be.
The 104th Training Corps arc follows Eren, Mikasa, and Armin as they join the training corps and bond with fellow recruits. Over its four chapters, One by One, Necessity, Delusions of Strength, and What Should I Do Now?, the trio comes to understand how demanding a soldier's life truly is.
The 104th Training Corps arc follows the Wall Sealing arc and leads into The Female Titan arc. It holds the third position in the overall sequence of the Attack on Titan manga's story arcs.
The 104th Training Corps arc consists of four chapters: One by One, Necessity, Delusions of Strength, and What Should I Do Now? These chapters were collected in volume 4 of the Attack on Titan manga.
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