After an exhausting day juggling jobs, Gain awakens in a suffocating darkness, trapped in an inexplicable void. Unable to control his surroundings, he’s plunged into an unsettling encounter with a mysterious figure before being jolted awake by his sister’s voice. But the girl standing before him isn’t the 17-year-old Saya he remembers—it’s an 8-year-old version of her, and worse, his own body has regressed to that of a child. The siblings quickly learn they’ve been transported to a medieval fantasy world—a shocking revelation compounded by Saya’s cryptic insistence that this is a chance for a fresh start. However, Saya hides a grim truth: they’ve been reincarnated into the world of Lost Chronicles, an RPG infamous for its tragic outcomes and impossibly bleak endings. Can Saya bend the rules of a world set on destruction? Will Gain uncover the secrets Saya is desperately hiding? Or will they both fall victim to the game’s relentless, dark design?