One day Haruhiro wakes up in an unfamiliar cave. He, as well as the people who are with him, remembers nothing about themselves except their names. When the characters leave the cave, they are led into an unfamiliar city and offered to become soldiers fighting the monsters surrounding the city. Since there aren’t many other ways to earn a living in the city, the heroes have to agree. However, the members of Haruhiro’s group are so weak that they can barely even pay for lodging and food.