"Underworld Office: 日本語版" is a captivating chat-style visual adventure game that immerses players in the world of ghosts. Players assume the role of Eugene, who, after a chance encounter, finds himself in the ghost world and is saved by a mysterious ghost from a monster attack. To repay this debt, Eugene is tasked to work at the "Underworld Office," leading to a series of intriguing choices and consequences.

The game boasts unique characters, approximately 40 short animated scenes, multiple endings and sub-routes to explore, 25 achievements to unlock, and over 60 illustrations. It caters to fans of light novels, visual novels, mystery stories, interactive story games, and exploration adventure games.