Kokoro Anzai, a first-year at Yukishina Junior High School, uncomfortably stays at home due to bullying.

While inspecting, she is dragged into the mirror and finds herself in front of a castle on an island surrounded by water.

The self-proclaimed Wolf Queen introduces her to six others: Subaru Nagahisa, Akiko Inoue, Rion Mizumori, Earth Masamune, Fūka Hasegawa, and Haruka Ureshino.

Addressing them as Little Red Riding Hoods, the Wolf Queen instructs them to find a key hidden in the castle, which will lead them to a room where one can make a wish, before the deadline of March 30 of the following year.

On the second to last day, Kokoro finds an illustration titled "The Wolf and the Seven Young Goats", and realizes that this was a clue to the key's location.

Kokoro passes through the broken remnants of the mirror, and uses the clues in the illustration to find the key.

Before they have to return and forget about the castle, they realize that they were in fact from the same universe but from different timelines spanning over 40 years.

After all of them have passed through, Rion confronts the Wolf Queen, and it is revealed that she is his late sister, Mio.

[4] GKIDS acquired the rights to the film in North America, and screened it in Japanese and English-language formats in June 2023.

[25] The film premiered on television for the first time on Nippon TV's Kin'yō Road Show [ja] programming block on February 9, 2024.

[29] Richard Eisenbeis of Anime News Network gave the film a 'B-', applauding its social commentary on bullying in Japan and its relatable cast of characters, but criticizing its plot twists, which are 'easy to see coming'.