Makikomarete Isekai Teni suru Yatsu wa, Taitei Cheat

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?