There Is Someone in the Coffin of Coffin Hope

After receiving a phone call from the cemetery, my life changed. The ghost who told me in advance that I was about to die, the love left over from high school, the coffin that could possess the deceased when lying in it, the ghost school full of children, what is it that affects all of this? This is an era where individual gods and ghosts are classified into different categories. How can I, a mortal, blend in among them? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.