Synopsis: Dungeon Busters: I Am Just Middle-Aged Man, But I Save the World Because of Appeared the Dungeon in My Home Garden.

In order to prevent total destruction, the daunting task of clearing all 666 dungeons within the next decade looms before them. A stroke of luck leads Kazuhiko Ezoe to stumble upon a secret underground space on his property, activating the Dungeon System and resulting in the creation of the world's very first dungeon. With the help of a guide, the enigmatic Akane, Ezoe learns that failure to clear all dungeons within the given timeline will spell doom for the entire world. As nations scramble to address the sudden emergence of dungeons across the globe, Ezoe forms Dungeon Busters Inc. to gather allies and execute their mission of protecting the world from inevitable devastation. Embark on this thrilling and realistic dungeon adventure today!