The year is 1868; English nobleman George Joestar and his son Jonathan become indebted to Dario Brando after being rescued from a carriage incident. What the Joestars don't realize, however, is that Dario had no intention of helping them; he believed they were dead and was trying to ransack their belongings. After Dario's death 12 years later, George—hoping to repay his debt—adopts his son, Dio. While he publicly fawns over his new father, Dio secretly plans to steal the Joestar fortune. His first step is to create a divide between George and Jonathan. By constantly outdoing his foster brother, Dio firmly makes his place in the Joestar family. But when Dio pushes Jonathan too far, Jonathan defeats him in a brawl. Years later, the two appear to be close friends to the outside world. But trouble brews again when George falls ill, as Jonathan suspects that Dio is somehow behind the incident—and it appears he has more tricks up his sleeve.

Turning against his former allies and enemies alike, Eren Yeager sets a disastrous plan in motion. Under the guidance of the Beast Titan, Zeke, Eren takes extreme measures to end the ancient conflict between Marley and Eldia—but his true intentions remain a mystery. Delving deep into his family's past, Eren fights to control his own destiny. Meanwhile, the long-feuding nations of Marley and Eldia utilize both soldiers and Titans in a brutal race to eliminate the other. Reiner Braun uses his own powers in a desperate bid to hold off Eren's own militaristic force, and his fellow Eldians—children Falco Grice and Gabi Braun—struggle to survive in the unfolding chaos. Elsewhere, Eren's childhood friends Mikasa Ackerman and Armin Arlert remain imprisoned alongside Eren's former Survey Corps companions, all disturbed by Eren's monstrous transformation. Under the blind belief that Eren still secretly harbors good intentions, Mikasa and the others enter the fray in an attempt to save their friend's very soul.

The Abyss—a gaping chasm stretching down into the depths of the earth, filled with mysterious creatures and relics from a time long past. How did it come to be? What lies at the bottom? Countless brave individuals, known as Divers, have sought to solve these mysteries of the Abyss, fearlessly descending into its darkest realms. The best and bravest of the Divers, the White Whistles, are hailed as legends by those who remain on the surface. Riko, daughter of the missing White Whistle Lyza the Annihilator, aspires to become like her mother and explore the furthest reaches of the Abyss. However, just a novice Red Whistle herself, she is only permitted to roam its most upper layer. Even so, Riko has a chance encounter with a mysterious robot with the appearance of an ordinary young boy. She comes to name him Reg, and he has no recollection of the events preceding his discovery. Certain that the technology to create Reg must come from deep within the Abyss, the two decide to venture forth into the chasm to recover his memories and see the bottom of the great pit with their own eyes. However, they know not of the harsh reality that is the true existence of the Abyss.

The people of the kingdom look down on the young Prince Bojji, who can neither hear nor speak. They call him The Useless Prince while jeering at his supposed foolishness. However, while Bojji may not be physically strong, he is certainly not weak of heart. When a chance encounter with a shadow creature should have left him traumatized, it instead makes him believe that he has found a friend amidst those who only choose to notice his shortcomings. He starts meeting with Kage, the shadow, regularly, to the point where even the otherwise abrasive creature begins to warm up to him. Kage and Bojji's unlikely friendship lays the budding foundations of the prince's journey, one where he intends to conquer his fears and insecurities. Despite the constant ridicule he faces, Bojji resolves to fulfill his desire of becoming the best king he can be.