The studio ufotable released a special behind-the-scenes video for the film Demon Slayer : Kimetsu no Yaiba – Infinity Castle , revealing details of the creative process behind the Akaza Returns . The material highlights how the team maintains hand-drawn animation as a cornerstone of the production.
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While much of the industry is migrating to fully 3DCG , ufotable follows a more artisanal approach. This way, each scene is created on paper before receiving digital finishing touches. In total, more than 2,200 cuts were produced manually, requiring intense coordination between directors, animators, and art supervisors.

Furthermore, the video shows how 3D acts as a structural support for the Infinite Castle . The environment ignores traditional rules of space and gravity, allowing for complex camera movements. Thus, 2D conveys emotion and intention, while 3D organizes depth and scale.
On the other hand, the level of control is impressive. Each effect is adjusted in fractions of a second. Finally, the behind-the-scenes footage reinforces why Kimetsu no Yaiba remains a technical benchmark in anime cinema .
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Source: YouTube Oscar
