The Extraordinary, the Ordinary, and SOAP! Volume 3 by Nao Wakasa

After being forced to stop in the Kingdom of Dal Canto, Lucia and her friends continue their journey to purify the Cristallo Sacro and save the world. The party, which had been awkward at first, had finally come together as true companions as they approached their final stop. When Lucia and Maria decide to purify the last tree together, a black dragon with the power to destroy an entire country appears. Lucia manages to purify it, but her Soap disappears along with it!?