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.

Café Stile gets a new waitress, Miu Amano, and she’s assigned to play a “big sister” character. Actually, Miu has a surprising secret that astonishes the rest of the Stile staff when they hear it. She masters the “big sister” act right off the bat, and in fact, Maika makes an effort to learn from her as a “role model” of how to masterfully interact with the clients, but it doesn’t go so well.

During a lunch break between matches, Nikaidou pressures Rei to win all his matches so they can battle in the finals. Rei looks on coolly until Nikaidou points out feelings Rei never realized he had. Meanwhile, at the Kawamoto house, Someji, Akari, Hinata and Momo have a brainstorming session about Crescent Moon’s new summer sweet creation. Momo proposes novel ideas, but the usually cheerful Hinata seems down...

The members of Beit — Watanabe Minori, Takajou Kyouji, and Pierre — are shooting an video for the shopping district and decides to help out with their upcoming festival. In the midst of preparation, something happens to Pierre?!

Dia realizes that Kanan and Mari seem to have gotten closer to the other members of Aqours while she hasn't, and starts wishing that they would call her "Dia-chan."

Lupin and the rest move forward with the plan to capture the train Finis is riding. Lupin and Cardia board the train in disguise, and all seems to go as planned... until a man appears before Lupin.

Gao is challenged by a mysterious Buddyfighter who wants to become Wisdom's right hand man.

Sophie continues the search for any clues that may lead her to her brother, Martin. Since the word "El Dorado" was the only thing her brother left behind, she desperately tries to hunt down the elusive Sword in order to gather more information.

Ren confronts one of the group of new students about what they want. Ayane begins to show signs of supernatural abilities.