人知れず世界を救った勇者が帰還する。 (Associated Names)

Nearly a century ago, mysterious “holes” began to appear all over the world. From these holes, unidentified monsters emerged, wreaking havoc on people, cities, and entire nations. Humanity feared that this marked the end of their existence. But amidst the chaos, a courageous man rose to confront the monsters. He fought valiantly, slaying these beasts.…