An Ordinary Office Worker's Dungeon Log

Three years ago, in 2022. Every tower in the world turned into a dungeon. The Washington Monument in the United States. China's Oriental Pearl Tower, France's Eiffel Tower, London's Big Ben, and Japan's Tokyo Tower. Towers all over the world suddenly, without warning, transformed into dungeons like those seen in games and anime. The world was shaken as the dungeons rumbled into existence. Three years later, in 2025, Ono Shiro, a stiff office worker who could barely stand, returned to his apartment and found a strange high school girl, Hoshino Akari, sitting there in the cold. After hearing her story at home, the two discovered they had something in common. At Akari's request, Shiro became an adventurer with her and decided to conquer the Tokyo Tower dungeon.