Borderline

"Grisha... I... no matter what I become... don't worry. I'll find you."

- Dina to Grisha Yeager as she is about to be transformed into a mindless Titan.

Kyōkaisen (境界線) is the 1st chapter of the 22nd volume and the 87th chapter overall of the Attack on Titan manga, written and illustrated by Hajime Isayama.

Overview
After Zeke exposes the Eldia Restorationists, Grisha and the others are subjected to torture by Marley officers in order to reveal the identity of The Owl. But when the officers get nothing, the group is sent to the borderline of Paradis to be transformed into mindless Titans as sentence for treason.

On top of the wall, Grisha recognizes Kruger and meets Grice, who blames Grisha for Zeke's betrayal. Annoyed by Grice's outburst, Major Gross throws him to the sand dunes, with the intention of making the other Restorationists eat him once they are transformed for his own amusement. Grisha recognizes Gross as the official who killed his sister 15 years ago, and several Restorationists are transformed into Titans and begin chasing Grice.

Grisha sees Dina being brought next to him to be transformed. He tries to protect her by shouting that she has royal blood and therefore is important to Marley, but he is shut up by Kruger, and Grisha notices he is covering up that fact. Dina is injected and transforms into the Smiling Titan.

Eren wakes up screaming in a cell. Not remembering where he is, Armin reminds him that he and Mikasa are serving punishment for violating military law. Having connected to his father's memories after reading the books, Eren is disturbed by the notion that the Smiling Titan was Dina.

Back in the past, Dina's Titan goes after Grice like the other Titans. Grisha reproaches Gross for this and for his sister's murder, and Gross recognizes Grisha as well and decides to transform another Restorationist into a 3-4 meters Titan and have fun by making Grisha fight him. As the Restorationist is transformed, Grisha questions Gross about the reason of his cruelty, and he explains that he considers Eldians alike to rats and wishes for them to be eliminated from the world. Grisha complains that the story spread by Marley is false, but Gross does not listen and tries to throw him from the wall. However, Kruger throws Gross instead, and as Gross is eaten by the Titan, Kruger reveals himself as The Owl. Kruger asks Grisha to pay attention because he will show him how to use the power of the Titans, as he injuries his own hand, triggering a transformation into Titan and destroying the Marleyans' ship.

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