One day Haruhito wakes up in an unfamiliar cave. He—along with the people who are there with him—doesn’t remember anything about themselves except their name. When the characters leave the cave, they are taken to an unknown city and offered to become soldiers fighting monsters that surround the city. Since there aren’t many other ways to earn money in the city, the heroes have to agree. However, the members of Haruhito’s group are so weak that they can barely even pay for lodging and food.