Wit Studio apologizes for generative AI use in Ascendance of a Bookworm
Intelligence Summary
- Wit Studio confirms generative AI was used in Ascendance of a Bookworm season 4’s opening and issues an apology.
Wit Studio apologizes after generative AI use in Ascendance of a Bookworm
Wit Studio has apologized after confirming that generative AI was used in the opening of the fourth season of the anime Ascendance of a Bookworm. The season, based on Miya Kazuki’s popular light novel series, premiered on April 4, 2026.
Generative AI use confirmed
The studio, known for award-winning series such as Attack on Titan (seasons 1-3) and Spy x Family, launched an internal investigation after fans raised suspicions about the use of generative AI in the opening. Viewers shared their observations on social media, with Reddit and Twitter/X serving as the main platforms for criticism. After the review, Wit Studio confirmed that AI had been used to generate backgrounds for the opening.
Wit Studio’s response
In its official statement, Wit Studio said it does not generally use generative AI in its productions. The studio acknowledged that AI technology was used in this specific case due to a failure in production management and quality control. Wit Studio also confirmed that no other instances of AI use were found within Ascendance of a Bookworm.
Redraw and future plans
In response, the studio announced that future episodes of Ascendance of a Bookworm will feature a redesigned opening with the AI-generated elements removed. Starting with episode 2, the old footage will be fully recreated without using AI. Wit Studio said the incident will be used as an opportunity to review its guidelines and production management systems to help prevent similar issues in the future.
Timeline
April 4, 2026: The first episode of Ascendance of a Bookworm season 4 premieres.
April 10, 2026: Wit Studio confirms generative AI use and announces a redesign of the opening.
April 10, 2026: Wit Studio publicly apologizes for the use of generative AI and strengthens its guidelines.
The use of generative AI in anime remains a hot topic. Previous incidents, such as Amazon removing the AI-generated English dub of Banana Fish, highlight how sensitive this technology is within the industry. For anime studios, keeping track of AI use can be difficult, especially when different parts of production are outsourced to multiple companies. The situation surrounding Ascendance of a Bookworm may push other producers to improve their monitoring processes and ensure unauthorized AI use does not make it into the final product.
