is a Japanese light novel series written by Satsuki Nakamura. The series originated on the Shà Âsetsuka ni Narà  website in July 2020, before being published in print with illustrations by YukiKana by Ichijinsha beginning in December 2020. A manga adaptation, illustrated by Ei Ohitsuji, began serialization in Monthly Comic Zero Sum in the same month. An anime television series adaptation produced by Doga Kobo is set to premiere in July 2026.
In the kingdom, there is a place where unmarried women from the five noble are gathered and trained to become the next generation of queens. Kou Reirin, a princess from one of the five families, is known as a "butterfly" for her beauty and kindness, while Shu Keigetsu, another princess from the five families, is said to be a "court rat" and is disliked by the people of the palace. Keigetsu is jealous of Reirin and uses magic to cause them to switch bodies.
Written by Satsuki Nakamura, the series began publication on the novel posting websiteàShà Âsetsuka ni Narà  on July 15, 2020. The series was later acquired by Ichijinsha, who began publishing the series in print with illustrations by YukiKana on December 28, 2020. As of September 2025, eleven volumes have been released.
In March 2022, Seven Seas Entertainment announced that they licensed the series for English publication.
A manga adaptation, illustrated by Ei Ohitsuji, began serialization in Ichijinsha's magazine Monthly Comic Zero Sum on December 28, 2020. As of September 2025, the series' individual chapters have been collected into nine volumes.
Seven Seas Entertainment is also publishing the manga in English.
An anime television series adaptation was announced on March 17, 2025. It will be produced by Doga Kobo and directed by Mitsue Yamazaki, with Yoshiko Nakamura handling series composition, Ai Kikuchi designing the characters, and Yukari Hashimoto composing the music. The series was originally scheduled for April 2026, but was later delayed due to delays in production progress. It is set to premiere in July 2026 on TV Tokyo and its affiliates.
Along with Jin Kizuki'sàShinya Eigyà  Kujiratei: Gozen 0-ji no Napolitan, the series won the grand prize in the light novel category at 's "Minna ga Erabu!! Denshi Comic Taishà  2023" competition in 2023. The series has 3 million copies in circulation.
In the 2022 Next Manga Award, the manga ranked seventh in the print category. In the 2023 edition of the Kono Manga ga Sugoi! guidebook, the series ranked seventeenth on the list of the top manga for female readers.