Story
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. Kazuhiko Ezoe 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.
Synopsis via AniList (English).
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