Tag: What does Nico Nico knee mean?
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What does Nico Nico NII mean?
This is a pun using her name (Nico) and the onomatopoeia for “smiling” or ニコニコ(niko niko) This is why part of the longer line you have included has Egao todokeru/”delivering a smile”. … So the nii part also evokes a smile when saying it out…