Okutama Kojin Meikyuu - Shinshoku Shite Kita Isekai MeikyuuNew

"Dungeons are invading Japan! Conquer dungeons of swords and magic with 'modern science'!" A dungeon suddenly appeared in the modern world. And the witches by the magic essence "mana" overflowing from the erosion mouth. A new occupation "Adventurer" is born.