Does Anyone Really Care About Nonsense Stories?

Book Title: "Does Anyone Really Care About Nonsense Stories?" If a person's personality changes due to the occurrence of a certain event, then as a friend, how should you choose? They may even forget you because of changes in personality~ In other words, as the other person's friend, what kind of decision would you make? But the cause of everything is a kind of ethereal existence - ghost. Unusual things happen every day. No matter how hard you try, you can't die. You can still be back to your original state the next day. The condition is that a "certain event" occurs. In order to solve various puzzles, the story unfolds...