The Ancient Magus' Bride: Those Awaiting a Star

Overview:

A prequel to The Ancient Magus' Bride, Angelica sends Chise some magical supplies, including a gift. The gift turns out to be a book she read in her childhood. Elias becomes curious and asks Chise to tell him the story behind the book. She tells him about Miura-san and the mysterious library she found in the forest when she was a child.