The Dungeon Records of Ordinary Office Workers

Three years ago, in 2022 AD. Every tower in the world has been turned into a dungeon. Washington Monument, USA. China's Oriental Pearl Tower, France's Eiffel Tower, London's Big Ben, and Japan's Tokyo Tower. Towers around the world suddenly, suddenly, without warning, turn into dungeons that appear in games and anime. The world shook, and the rumblings of the underground city descended. Three years later in 2025. When Ono Shiro, a dull office worker who cannot stand, returns to his apartment, he finds a strange female high school student - Hoshino Akari sitting in the cold weather. After returning home and listening to the story, the two had one thing in common. At Akari's request, Shirou becomes an adventurer with her and decides to capture the dungeon of Tokyo Tower.