A young man want to marry the mother of the hero’s party. The primary character, Ceres, embarked on the mission to vanquish the demon king as a member of the hero’s group. However, the hero abruptly fired him one day, so he was forced to leave the group. Ceres, who was all by himself, looked for a domestic slave to look after him. The mother of the hero, Ms. Shizuko, was being sold as a slave when he visited the slave market.