Himote Salaryman 40-sai no Tanjoubi ni Totsuzen Daimadoushi ni Kakuseisuru: #Hanaoka Shuutarou 40-sai Dokushin Kanojo Nashi ga Sekai Trend 1-i

A world of modern Japan where dungeons have appeared. Shutaro Hanaoka, a middle-aged salaryman with an old-looking face (and a virgin), suddenly notices on the morning of his 40th birthday that his status has reached abnormal values. And the job he awakened to was "Archmage." Though bewildered, he decides to join the "World Defense Organization," his long-time dream, and walk the path of a hero——. I couldn't become a "Mage" as a 30-year-old virgin, but I awakened as an "Archmage" as a 40-year-old virgin!? Source: MU