Having given up on life, 15-year-old Chise Hatori sells herself at an underground auction, where she is bought by Elias Ainsworth, a not-quite-human mage, for 5 million pounds. She learns that he intends for her to be his future bride, and her world begins to change.

Few people know the truth about the bookstore on the outskirts of London that Elias frequents. He takes Chise there, where they meet Angelica, who teaches Chise a little bit of magic, but... The true power of the Sleigh Beggy materializes a fragment of Chise's memories.

In the land of dragons two young dragons are kidnapped from Lindel by Cartaphilius. Chise awakens from a dark dream to find, Alice, Renfred, Adolf and college administrator Tory Innis in Elias’ home. They explain Cartaphilius stole the two dragons using a teleportation device he stole from Renfred and want Elias to find the dragons and take them home

After returning from camp, Lucy is still unconscious and it's still not clear what's behind her sudden loss of strength...this worries Chise deeply.

While watching over Lucy, Chise discovers her connection to Seth and their family's tragic history. While a professor seems to have been the victim of a user of a banned book, a mysterious killer seems to resurface...

Apparently, a forbidden magic book called "The Testament of Carnamagos" is being used to rob Lucy and Simeon of their magical powers. But who exactly is behind it is still unclear. Elias takes care of the matter because he fears that otherwise Chise will put herself in danger for her friend and because he himself wants to protect a friend.

It's time for family explanations, whether between Lucy and her brother, or Alice and Renfred. The College is also going through a complicated period where other magicians seem to want to harm new students.

Bored with having nothing to do but study, the students play a puzzle game, but it stirs up bad memories for Philomela and Rian. Alcyone ponders her assigned role. As the rainy season starts, Elias and Chise finally sit down to catch up.

The mystery deepens as all the students drained of magic suddenly wake up feeling fine. Rumors about the culprit start to rise among the student body. Veronica checks in on Philomela.

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.