Danbooru-based image board with a specialization in high-quality images.
asahina_mikuru headphones ito_noizi pantsu suzumiya_haruhi_no_yuuutsu

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I might be wrong, but doesn't this seem like Nanatsuiro Drops?
I thought it was a original, its in Noizi's first artwork collection Gu-ren from what I remember, uploaded the scan from the page you can check it here: