Danbooru-based image board with a specialization in high-quality images.
animal_ears atelier_tiv bokura_wa_minna_ikiteiru! nekomiya_niu tail tiv trap

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Err, how to edit a tag? i've tried but it's still remain the same, the correct one is Nekomiya Niu, 猫宮ニウ.
You can't and don't need to "edit" a tag, just delete the old one and tag images with new one. If none of image is tagged by old one for a while, it would be deleted by system automatically.