The strongest HERO is a convenience store manager

Hisashi Tanaka is the manager of the Chuo Higashi-dori branch of Anshin Mart. Exhausted from his daily grind, he thinks, “I just want to go somewhere… far, far away…” — only to find himself suddenly transported to an unexpected alternate world!? Can the hero Tanaka save the world using his convenience store skills!? (Source: Ganma!, translated)