The beloved isekai series Ascendance of a Bookworm is charging forward into nobility with its fourth season, now officially subtitled Adopted Daughter of an Archduke. The anime has unveiled a gripping main trailer alongside confirmation of its April 4, 2026 premiere, promising elevated production values, deeper immersion into the intricate world of Ehrenfest, and a striking new key visual.
This latest trailer bursts with vibrant animation, spotlighting Rozemyne's transition into high society after her adoption by the archduke. It teases intense political tensions, magical rituals, and her relentless drive to spread literacy through invention, all rendered with breathtaking detail in backgrounds and character expressions. The visuals emphasize the contrast between opulent noble life and the protagonist's humble origins, while hinting at escalating rivalries and alliances that will shape her path.
Here is the first visual for Ascendance of a Bookworm Season 4:
A major highlight is the shift in animation production to WIT Studio, known for its high-quality work on series like Attack on Titan and Vinland Saga. This change promises smoother animation, richer visuals, and more dynamic presentation compared to previous seasons. Yoshiaki Iwasaki directs the series, Mariko Kunisawa handles series composition to faithfully adapt Miya Kazuki's light novels, Aiko Minowa provides character designs, and Michiru returns to compose the soundtrack.
Yuka Iguchi continues voicing Rozemyne (formerly Myne), perfectly capturing her sharp intellect, childlike wonder, and unyielding determination. Sho Hayami reprises Ferdinand, the enigmatic high priest whose guidance and occasional exasperation remain central to the dynamic. The ensemble cast from earlier seasons returns, ensuring seamless continuity across the growing cast of family, retainers, nobles, and temple figures.
The opening theme Pages, performed by the popular vocal group Little Glee Monster, infuses the season with an energetic and uplifting vibe. Its lyrics celebrate discovery, creation, and perseverance—mirroring Rozemyne's mission to forge books in a book-scarce society.
The series will premiere on April 4, 2026, airing on Yomiuri TV and Nippon TV at 5:30 PM JST, with additional broadcasts on TOKYO MX starting April 6 at 9:25 PM JST. It will run for two consecutive cours, spanning a full half-year to thoroughly explore the Adopted Daughter of an Archduke arc. In this phase, Rozemyne's ambitions evolve from personal projects to systemic change, as she tackles noble responsibilities, temple management, and efforts to challenge the rigid class barriers that restrict knowledge.
Here's Crunchyroll's description of Ascendance of a Bookworm:
Avid bookworm and college student Motosu Urano ends up dying in an unforeseen accident. This came right after the news that she would finally be able to work as a librarian like she had always dreamed of. When she regained consciousness, she was reborn as Main, the daughter of a poor soldier. She was in the town of Ehrenfest, which had a harsh class system. But as long as she had books, she didn't really need anything else. However, books were scarce and belonged only to the nobles. But that doesn't stop her, so she makes a decision... "If there aren't any books, I'll just create some."
For newcomers or those wishing to refresh, the first season of Ascendance of a Bookworm streams on Crunchyroll with English subtitles and dubbed versions available.
