Witch Hat Atelier 10 (manga)

During their heated reunion, Custas introduces his old friends to Ininia, a girl who is loyal to one of the Brimmed Caps. Suddenly, the young witch binds Coco and Tartah to a promise: The two must partake in the Silver Eve Procession. But to do so, they must conjure up a new spell, and quickly. As the weight of many secrets bears down on her, Coco cannot turn to Qifrey or her friends. When she happens upon Dagda, she sees his chest is marked with a forbidden magic...