Kage ni Kakureteta Ore ga Maougun ni Haitte Hontou no Shiawase wo Tsukamu made
陰に隠れてた俺が魔王軍に入って本当の幸せを掴むまで
Cromwell concealed his talents, staying in the background of his ideal best friends. One day, he is brought into the demon lord's army. Taking things more seriously, he works to restructure the army while coexisting amicably with his succubus secretary and a small demon girl.
Isinasalin pa — orihinal na teksto sa English.