You're in prison and all you have is a spoon. You use that prison spoon to scoop up nice scents and fragrances out of the air when you have outdoor time and bring them back into your cell.
You can't remember what any of these scents are anymore, you've been in prison for so long, so you call them all neo-scents (にお). They're neo, they're new.
Currently there are no similar looking kanji which exist in the WaniKani learning system