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Credit for summary Attack on Titan Season 4 Wikipedia.
Kruger, the wounded Eldian soldier, asks Falco to post letters for him from outside the internment zone to avoid interception. Willy, head of the Tybur family who possess the War Hammer Titan, meets with Commander Theo Magath near the statue of Helos, the renowned Marleyan who saved them from Titans.
Magath is considering introducing conscription to lift the Marleyans out of their complacency and thirst for expansion and self-destructive wars. They form an alliance to stop the warmongering and restore the balance between Eldia and Marley, however the planning for an all-out offensive against Paradis continues.
Back at the hospital, the patient Mr. Jaeger, Grisha's father, approaches Kruger and asks him to avoid using Falco for his schemes before he is removed for creating a disturbance.
At the evening dinner party before the festival, the Eldian trainees perform duties as waiters, but are rudely disparaged by the Marley elite. Willy uses his diplomatic skills to smooth tensions and invites the international dignitaries to a theatrical play to be performed after the festival in the Libero Internment Zone.
At the festival, everyone enjoys food from other nations and the trainees are in high spirits. That night, Falco takes Reiner to a secret basement location where he meets Kruger. Kruger is revealed to be Eren Jaeger, who tells Reiner that four years have passed since they last saw each other.
NOTE: This episode is from the end of Volume 24 of the manga.