One day during lunch break, a male high school student Yuzo Ogata suddenly transferred to another world of sword and magic together with 4 of his friends. According to the Princess of s.p.a.ce-Time Magician, a foreign world who summoned them, they want them to beat the Demon Lord as Heroes to save this world. Suddenly the princess said: “`―― 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?