Dungeon Busters ~Chuunen Otoko desu ga Niwa ni Dungeon ga Shutsugen shita node Sekai wo Sukuimasu~

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!
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* Web Novel (jp)
* Official English Light Novel