Level 1 no Ima wa Ippanjin-san: Hisshou Dungeon Unei Houhou Gaiden

Tanaka Tadanori was a programmer working a mid-sized company who was transported to the other world of Arorist. The other three people who appeared along with him were the Heroes while he alone was an ordinary person… Despite his low level and stats, he makes use of his experiences and knowledge to achieve greatness!! This is the story of Tanaka who is yet an ordinary person now. Source: Futabasha