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.

Chise is deep in thought as she watches the souls return to where they'd belonged all along. More than ten days have passed since the incident at Ulthar, but she is still in a deep sleep. Elias and Simon stand worriedly by her side, when they are met by two unexpected guests: Titania, Queen of Fairies, Lord of Tír na nÓg.

With the church's requests fulfilled, things were supposed to go back to normal. But Elias has been acting strange since the last request: he'd vanished on the first morning after Chise had spent a night in his room. Neither Angelica's kind words nor Ruth's pure words are enough to put Chise's mind to rest.

Chise and Selkie climb aboard a dragon's back to meet Lindel, to have her own mage's staff made. Frustrated by Chise's acceptance of her being kept as a pet by Elias, he describes the time he found Elias in the darkness. Meanwhile, Elias, who had stayed at home by himself, receives a letter from a sorcerer's college.

Chise and Elias are in the middle of shearing Wooly Bugs, magical creatures who eat cold from the air and grow wool with magical properties. Chise becomes distracted and is attacked. As Chise recovers, she and Elias open themselves up to each other more.

Christmas is coming up. Alice invites Chise out to London, where they hang out together and go gift shopping for Renfred and Elias.

Stella, a young girl Chise encountered while Christmas shopping, finds that her brother, Ethan, has gone missing and her parents have forgotten he exists.

Stella visits Chise with her payment of sweets. Elias, irritated by and jealous of Stella, runs away. Chise finds him hiding in a shadow but becomes worried as he restrains her and seems to want to eat her.

Chise attends her first day at the College with Elias in tow.

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.

Long ago, the humans and cats of Ulthar, city of cats, were struck by a great tragedy. For generations, the souls of those who were at the center of this tragedy have been sealed away by the king of cats. Chise and Elias travel to Ulthar in order to complete Simon's second task: to purify the spirits that remain.

With King Oberon taking Chise into the Fairy realm for recovery, Silke becomes agitated waiting at home. Chise slowly recovers under Dr. Shanon's care, a fairy that was raised as a human.

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

As the dragon rampages, Elias tells Chise they must absorb the dragon’s magic in order to stop it. This leaves Chise in a predicament as Elias becomes unable to help.

It's a day of new beginnings at the College as Chise attends her first day of classes and meets some of her fellow students, and Elias adopts a mysterious guise for his first time teaching as a visiting instructor.

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.

Elias, is an odd failure who pretends to be human -- but is it because of his master's words, or because of his distrust for humans, that he stopped communicating about himself? Lindel's alias, Echoes, refers to the to a song akin to the sound of snowmelt, traveling through the wind, causing the blooming of flowers and the dancing of fairies. The magic of the song turns into a mirror the surface of the water Chise peers into. What does she see beyond the mirror?

With Chise being transformed into a fox, she takes off running into the woods. Elias chases after her. Later, Chise is visited by the Leanan sídhe, who is attached to Joel, claiming that Joel will not wake up.

Elias and Chise attend Mariel’s coven meeting and meet Phyllis, Mariel’s high priestess. Secretly, Elias is given information that could help Chise. Following the meeting, Chise becomes suspicious of Elias' activities.

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.

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.

Violet and Chise host an after hours test of courage for their classmates by having them pair up to visit various haunted locations around campus, but the evening leads to some revealing conversations.

Elias earns the help of many, and they form a search party for Chise. Meanwhile, Chise and Cartaphilus relive his past together.

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.

The fight begins in earnest as Lizbeth starts to gain the upper hand, but Chise and company receive some unexpected assistance.