Lucas was used as a non-regular porter for the D-rank adventurer party "Recca no Fata". She believed in the words of the leader, Zash, who said that if she had the guts to do chores without pay for two years, she would be allowed to join, but Zash had not forgotten the fateful day when her joining was decided, and even expelled Lucas from the party. However, the party without Lucas doesn't go as well as usual... The thrilling adventure fantasy of the strongest adventurer born in the demon world and raised in a heroic family begins!