One day during lunch break, a male high school student named Takanashi Kyousai was suddenly transferred to another world of sword and magic together with four other friends. According to the Princess of Space-Time Magician, a foreign world summoned them and they want them to beat the Demon Lord as Heroes to save this world. Suddenly he was surprised at four friends "Temple", but it was a relaxing expression. Suddenly, the princess stated 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?