Labelle, who has never given up her dream of becoming an adventurer and continues to work as a baggage handler, an auxiliary job, is unilaterally expelled from the guild by Hans, an adventurer, who has a grudge against her. He is hunted down by an insidious plot, but then he meets Rion, a young swordsman in the same situation as he is. Seeing her hidden abilities and her own skills as an adventurer party, LaBelle decides to start a new guild, Oratorio!