Swept Up in the Common Sense of "That World

Souji Otake is a man scraping by at the absolute bottom of society's underbelly, earning meager daily wages just to survive. He shares his life with a younger sister who is not related to him by blood, yet remains the only person he truly cares for. Their fragile existence is shattered when she inexplicably wanders into a mysterious and dangerous realm known only as "that world." Driven by a desperate need to protect her and fulfill her deepest wish, Souji makes the perilous decision to step across the boundary into this unknown domain. What awaits him is not merely a different place, but an entirely alien reality governed by its own twisted logic and brutal norms. As he navigates this dark landscape, he finds himself increasingly entangled in its unforgiving rules. This noir science-fantasy novel follows Souji's harrowing descent as he struggles to retain his humanity while being swallowed whole by the common sense of a world that defies everything he once knew. To grant his sister's wish, he must adapt to a reality where survival demands sacrifice, and every new truth learned pulls him deeper into the abyss.