Lead: TO Books and the Ascendance of a Bookworm anime committee have locked an Ascendance of a Bookworm Part 4 television anime at Wit Studio, adapting the Royal Academy Library Committee arc right after Part 3’s finale.
What happened
On October 3, 2026, publisher TO Books posted a PR Times release confirming that Miya Kazuki’s Ascendance of a Bookworm (Honzuki no Gekokujō) Part 4 novel arc — titled Founder of the Royal Academy’s So-Called Library Committee (Kizoku-in no Jishō Tosho Iin) — will receive a new TV anime. Wit Studio returns for the project after handling Part 3: Adopted Daughter of an Archduke. The official anime X account and site mirrored the same studio lock the same day, and Anime News Network, Oricon, Animate Times, and AnimeAnime carried matching confirmations.
Part 3 premiered April 4, 2026 on Yomiuri TV / NTV at 5:30 p.m. JST and ran two consecutive cours through a half-year national broadcast. That run ended on Saturday, October 3 — the same calendar day the Part 4 greenlight landed. Crunchyroll has been streaming Part 3 with English subtitles and an English dub, continuing the platform’s prior seasons of the franchise.
TO Books’ release cites more than 14 million copies in circulation for the series (including digital). The announcement package includes an ending-card illustration by novel artist You Shiina; it does not name Part 4’s director, series composer, character designer, premiere window, episode count, or returning cast. For context only: Part 3 at Wit was directed by Yoshiaki Iwasaki, with scripts by Mariko Kunisawa, character designs by Aiko Minowa, and music by MICHIRU, starring Yuka Iguchi as Rozemyne and Show Hayami as Ferdinand — none of those roles are reconfirmed for Part 4 yet.
Earlier anime seasons (Parts 1–2) were produced at Ajia-do beginning in October 2019. Wit’s takeover for Part 3 made the studio the current house for the Ehrenfest noble arc; Saturday’s notice keeps that pipeline intact into the Royal Academy setting rather than handing the next novel volume block to a new production committee overnight.
Why Ascendance of a Bookworm Part 4 matters
An immediate Ascendance of a Bookworm Part 4 lock is the cleanest possible sequel signal: the committee is not parking the franchise after a long two-cour investment. Part 4 is the school / Royal Academy stretch where Rozemyne’s bibliomania collides with dorm politics, other duchies, and an on-campus library large enough to derail every noble lesson plan — the arc light-novel readers have been waiting to see animated since the print volumes closed the main series in December 2023.
Wit staying on also matters for visual continuity. Part 3 already reset character designs under Aiko Minowa and rebuilt the show’s noble-court look after the Ajia-do seasons; keeping Wit reduces the risk of another full redesign pause between Part 3’s ending and the academy premiere. For Crunchyroll’s bilingual audience — and for drawing desks that track Rozemyne’s wardrobe and book props — a named Part 4 title is more useful than a vague “more seasons planned” teaser.
Commercially, TO Books is leaning on a 14-million-copy print-plus-digital base and Wit’s recent national two-cour footprint. That combination is aimed at keeping the franchise in the same mainstream late-afternoon / early-evening conversation that carried Part 3, not demoting it to a late-night one-cour trial.
What we know vs what is rumored
- Confirmed: Ascendance of a Bookworm Part 4 (Founder of the Royal Academy’s So-Called Library Committee) is greenlit as a TV anime; Wit Studio is producing; TO Books announced on October 3, 2026 via PR Times; official anime social posts and ANN / Oricon / Animate Times / AnimeAnime match; Part 3 (Adopted Daughter of an Archduke) finished its two-cour Yomiuri TV / NTV run on October 3, 2026; Crunchyroll streams prior seasons including Part 3; You Shiina ending-card art was released with the announcement; series circulation stated at over 14 million copies including digital.
- Unconfirmed: Premiere year or broadcast season for Part 4; episode count or cour length; whether Yoshiaki Iwasaki, Mariko Kunisawa, Aiko Minowa, or MICHIRU return; whether Yuka Iguchi, Show Hayami, and the Part 3 supporting cast continue; Crunchyroll’s Part 4 simulcast or dub plan; any theatrical or OVA bridge between Part 3 and Part 4.
What happens next
Watch for a staff-and-cast drop, a first key visual beyond the Shiina ending card, and a broadcast window — typically the next public milestones after a bare studio lock. Until those land, treat Part 4 as confirmed in production at Wit with no air date. Readers catching up can finish Part 3 on Crunchyroll while the committee builds the Royal Academy arc.
Sources: TO Books / PR Times — 「貴族院の自称図書委員」TVアニメ化決定！; Anime News Network — Ascendance of a Bookworm Novels’ Part 4 Gets TV Anime From Wit Studio; Oricon News — 『本好きの下剋上』続編「貴族院の自称図書委員」編アニメ化決定; Epicflix — Ascendance of a Bookworm Anime Continues With Part 4 at WIT Studio