High school student Takatori Tsubasa was suddenly transported to another world one day on his way to school… For the next ten years, he changed his name to the other world and led a steady life as an adventurer. However, one day on the way back from a job, he heard a rumor from his partner, Ain. “It seems that the Holy Kingdom, our country, has summoned a hero.” He thought it had nothing to do with him, but on his way back from the tavern, he saw his classmate who had become a s*ave. The protagonist sets out to rescue. At that moment, his fate would change dramatically.