The latest trailer for the currently airing Ascendance of a Bookworm: Adopted Daughter of an Archduke has been released, highlighting the show’s new ending theme song. The fourth season of the fantasy anime series began broadcasting in Japan on April 4, 2026.

The second cour will resume with the anime’s 13th episode overall on July 11, 2026. 

The new ending theme for the second cour of Ascendance of a Bookworm: Adopted Daughter of an Archduke is “Wanna me” by adieu (the music stage name of Japanese actress Moka Kamishiraishi).  

© 香月美夜・TOブックス／本好きの下剋上製作委員会２０２６

The ending theme is also featured in the trailer, along with the second cour’s new opening theme “Power of Love” by Kana Nishino, which was announced last week in a short promotional video.

The first cour’s opening theme was “Pages” by Little Glee Monster, while the ending theme was “Ima mo Arigatou” by Erika Ikuta. 

Yoshiaki Iwasaki (Kowloon Generic Romance) is directing the fourth season, with Mariko Kunisawa (The Dinner Table Detective) as series composer and Aiko Minowa as character designer. WIT Studio is in charge of the animation production, which takes over from Ajia-do, who produced the previous three seasons.  

Meanwhile, the anime’s main voice cast is headlined by Yuka Iguchi as Rozemyne and Sho Hayami as Ferdinand. 

The anime’s first season debuted in Japan in October 2019. It was followed by a second season in April 2020 and a third season in April 2022. Crunchyroll is streaming the anime’s previous seasons in select countries and territories worldwide.  

Ascendance of a Bookworm: Adopted Daughter of an Archduke adapts the third part of the isekai fantasy light novel series written by Miya Kazuki and illustrated by You Shiina. The series was first published in 2013 on Shosetsuka ni Naro before being physically published as a light novel by TO Books from January 25, 2015 to December 9, 2023. A total of 33 volumes were released in Japan. 

The series has inspired spin-offs, short story collections, and manga adaptations, as well as a sequel light novel series in April 2017. 

© 香月美夜・TOブックス／本好きの下剋上製作委員会２０２６

J-Novel Club licensed both the Ascendance of a Bookworm light novel and manga series for English release. It describes the first volume of the novel series’ third part as:

Following a disastrous encounter with a noble, Myne finally resolves to say goodbye to her family and friends in the lower city, changing her name to Rozemyne and beginning her new life as the adopted daughter of Ehrenfest’s archduke. However, her days as an archnoble in noble society are brutal, as she is put through rigorous etiquette and magic training on top of her duties as High Bishop and forewoman. It all proves too much for a weak little seven-year-old girl… Or it would have, had the High Priest not offered her the keys to the temple’s book room as a reward. If she could get her hands on those, she’d be able to read all sorts of precious books! Her name may have changed, but Rozemyne’s passion for books remains the same as she charges into a whole new world! The detailed setting expands as the printing industry grows in size. 

Sources: Ascendance of a Bookworm Official X/Twitter (2) (3), Anime News Network