The College is sealed off to protect the students and staff from whatever or whoever has been sapping magic from victims. Zaccheroni puts the students' survival abilities to the test, but with a catch: no sorcery allowed.

Outside the College, the witches hunt for the missing book. Inside, the students try to juggle lessons with their own personal goals and relationships. Philomela confides in Alcyone, but an ominous message reminds her of her assignment.

Philomela bargains for Liza to undo the seal over the College so she can return home to fulfill her duty. As Chise gives chase, her power gives her a terrifying new form.