That guy, Ooki-san I think was his name, had died in an accident a week before from where the story is started. The guy (I don't remember his name) has insomnia and that has caused him to communicate with an apparition of Ooki-san. It's only hallucination.
I REREAD THIS CHAPTER MULTIPLE TIMES BUT NEVER UNDERSTOOD THE ONE STORY THAT HAPPENED AT THE LAUNDROMAT UNTIL NOW AND IM CRYING SO HARD