Two decades into a devastating apocalypse, former hero Hibiki exists as a fractured shadow of his former self. Twenty months have passed since the battles ended, leaving him adrift and scarred – not just physically, but with the crushing loss of everyone he held dear, including his daughter, Mirai. He’s a solitary wanderer until the Niiyama Foundation Group, spearheaded by Asuha, intervenes and pulls him from the brink. The reunion with Kanae, once a trusted ally, is fraught with tension; she recognizes a profound change in the man before her. Within the foundation's walls, Hibiki clings to a fragile hope: whispers of "Utopia," a legendary city believed to be humanity’s final refuge – and potentially, Mirai’s location.