Dungeon Busters : I Am Just Middle-Aged Man, But I Save the World Because of Appeared the Dungeon in My Home Garden.Dungeon Busters ~Chuunen Otoko desu ga Niwa ni Dungeon ga Shutsugen shita node Sekai wo Sukuimasu~; ダンジョン・バスターズ　～中年男ですが庭にダンジョンが出現したので世界を救います～; Dungeon Busters: I Am Just Middle-Aged Man, But I Save the World Because the Dungeon Appeared in My Home Garden.; Dungeon Busters: Aku Hanya Pria Paruh Baya, Tapi Aku Menyelamatkan Dunia Karena Dungeon Muncul di Kebun Rumahku.

Clear all the dungeons! There are 666 of them and 10 years to do it. If not, the only thing that awaits...is total annihilation. Ezoe Kazuhiko suddenly finds a mysterious underground space in his yard. When he steps into what turns out to be the very first dungeon in this world, he ends up activating the Dungeon System and learns from the mysterious beauty who appears to him, Akane, that the world is doomed to destruction if the 666 total dungeons that will be appearing in this world are not all cleared within 10 years. As countries begin taking measures in response to the dungeons appearing all over the world, Ezoe seeks out companions together with whom he establishes Dungeon Busters Inc., a company dedicated to clearing all the dungeons in the world! The curtains rise on this dungeon-delving epic with overwhelming realism! [web novel](https://ncode.syosetu.com/n3255fp/) (jp)