OVA released with the 9th volume of the manga.

Crime-ridden Ikebukuro is a haven for violent gangs, the Yakuza, and home to Makoto Majima. To protect his friends, this charismatic troubleshooter mediates disputes among the warring factions—even fixing problems the police can't. But when a rising tide of violence results in Makoto losing a loved one, can he ride out the storm, or will he drown in all the spilled blood that floods his streets? (Source: Funimation)

Gabi Braun and Falco Grice have been training their entire lives to inherit one of the seven titans under Marley's control and aid their nation in eradicating the Eldians on Paradis. However, just as all seems well for the two cadets, their peace is suddenly shaken by the arrival of Eren Yeager and the remaining members of the Survey Corps. Having finally reached the Yeager family basement and learned about the dark history surrounding the titans, the Survey Corps has at long last found the answer they so desperately fought to uncover. With the truth now in their hands, the group set out for the world beyond the walls. In Shingeki no Kyojin: The Final Season, two utterly different worlds collide as each party pursues its own agenda in the long-awaited conclusion to Paradis' fight for freedom. [Written by MAL Rewrite]

In 2024, the computer network prevails throughout daily life. Sora Yuuki is a 14-year-old girl. One day, she is invited to an online game "The World". After an accident in the game, the real world begins to deform.