クスタスと手を組んだ謎のつばあり帽・イニニアによって腕輪をつけられてしまったココとタータは、銀夜行列（ぎんやこうれつ）への参加を命じられます。出品するにふさわしい魔法を考えている最中、二人はダグダと再会！しかし彼の胸には、掟に背いた者であるという証の魔法陣が刻まれており――？！掴んだ魔法は絶望だったのでしょうか？想いの渦巻く銀夜祭は続きます。

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...