Production I.G created the animated O-Ren Ishii backstory in Quentin Tarantino’s Kill Bill: Volume 1.
The sequence explains how O-Ren survives childhood trauma, becomes an assassin, and rises within the criminal underworld. Its hand-drawn anime style sharply changes the film’s visual language while preserving the revenge narrative.
Production I.G is a Japanese animation studio founded in 1987. It is known internationally for work including Ghost in the Shell and other influential animated productions. The Kill Bill sequence was produced in Japan rather than animated by the main live-action crew.
The scene is sometimes attributed to Studio Ghibli because both companies are famous Japanese animation names. However, Production I.G is the credited studio for this specific segment.