Color Ghost

A ghost called Argo, died at the age of 23 by an unexpected car accident and has been roaming the Earth for 3 years. During this time he had been observing and peeking into others people's life. He then saw a man around his age and suddenly turned completely pink. He tries to avoid the man called Hibishi at first but at the end he decides to get close to him wishing he could see him and talk to him. When he unexpectedly transformed back to human!? Or did he? In front of the person he never thought he would be able to interact.