Those Guys Who Went To Marley is the second chapter of the Attack on Titan: High School manga, written and illustrated by Saki Nakagawa.
Overview: Reiner, Annie, Bertolt and Ymir are harassed at their new school for being transfer students. They are no longer regarded as humans, but demons. Ymir sends a picture of the other three being grabbed by a Titan, so Eren and co.
Summary: The day before the Attack Junior High graduation ceremony, Connie announces that he was accepted into Attack High, and everyone is excited, especially Eren. He starts to say that all members of their club will be together, but Reiner, Annie and Bertolt tell him that they're going to a different school. In the present, the three of them and Ymir are entering their new school; Marley Academy.
Source: Those Guys Who Went To Marley, available under CC BY-SA 3.0.