Usato Ken, an ordinary high school student with no particular talents, was unwittingly transported to another world on a stormy day alongside a handsome young man and a stunningly beautiful girl he had just befriended. Usato, who had always believed himself to be unremarkable, feared that he would be considered useless in this strange new realm. To his surprise, however, his companions proved unexpectedly kind. Moreover, Usato soon discovered that he possessed a previously unknown magical ability. Unfortunately, this newfound power did not bring him the happiness he had hoped for, as he was soon forced to endure a grueling regimen of training that felt like hellish torture.