One day 's lunch break, suddenly a male high school student Yuzo Ogata who has been transferred to another world of sword and magic together with four other friends. According to the Princess of Space-Time Magician, a foreign world who summoned them, they want them to beat the Demon Lord as Heroes to save this world. Suddenly I was surprised at four friends "Temple", but it was a relaxing expression ... ... where the princess told of a startling fact! "`?? There should only be four braves though?" "A man who was mistakenly summoned to a different world" What will be in store as to his fate?