Dungeon Busters

A man named Kazuhiko Ezoe discovers an underground chamber in his yard, which turns out to be the first dungeon in a series of 666 that will appear globally. Upon entering, he triggers the Dungeon System and meets Akane, who informs him that failure to clear all dungeons within ten years will result in the world's destruction. As nations respond to the growing number of dungeons, Ezoe forms Dungeon Busters Inc., a company aimed at clearing every dungeon. The story follows his efforts to complete this task and prevent global annihilation.