Once, a man was called to another world and successfully saved it. However, his notoriety led him to become a typical isekai character. Unfortunately, he fell into a trap and was forcefully sent back to his original world, starting over as a newborn babe. In this tale, we follow the once-great hero as a melancholy high school student, until he is unexpectedly summoned back to the same world that he had saved before in a fascinating turn of events.