***SPOILERS***
The concept is interesting, I'm not entirely sure how to feel. I think that Ma-Kun is but isn't a child. Meaning that yes, Ma-Kun is a child in the physical world but because he turned to a ghost the time that passed and the wish he had to be with Ono-Sensei aged him but because Ma-Kun didn't die it wasn't his true form-therefore causing him to still be a child if he ever returned to his real body (which he did). In all I'm not too sure how to feel due rto the age gap but the concept and story really did do well.
I Want to Feel You Because I Like You