Danbooru-based image board with a specialization in high-quality images.
disc_cover dorothy_(garakowa) dress dual_(garakowa) glass_no_hana_to_kowasu_sekai ishihama_masashi morisaki_sada no_bra remo_(garakowa)

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According to booklet, concept design & illustration by morisaki_sada and drawing by ishihama_masashi (the director of the movie).

Not sure what the difference is. From my understanding, "illustration" may refer to the palette-like background and the coloring?