I like the ghost. If ghosts are real, then they are just like that, ethereal beings commenting on our life without being heard by anyone but the reader (whoever this reader might be). That is, unless someone here have proof that they can talk to invisible people (in which case, please go see a doctor, the medical kind), I will assume that if ghosts exist, they cannot interfere with our lives.
I mean, not prevents the author of suddenly making the ghost to alter reality, but so far it seems the ghost will be only there experiencing the dread of not existing anymore and seeing the story develop regardless of himself. How you "read" this matters only to yourself. So far, I am reading this as:
- Spirits can only watch over you and wish you luck, but they can't act to help you. So it's okay to find solace in believing they are there with you, but only you can make a difference in your life and grow.
- Whatever you have to do, do as soon as you can. Don't take life for granted as if it had no end.
- Try not reading too much in one-page mangas so you don't end up "travelling through the mayonnaise" on some forum over the Internet.