Sai Giri finds himself transported to a new world as one of twenty heroes tasked with saving it from a demonic threat. His unique Gift he is given is Sour Apples, which despite tasting awful it increase his Durability. As Sai Giri faces the trials presented by royalty, demons, and a endless army of Horned Dogs. His ultimate goal is to not only endure but thrive in this unfamiliar world.