It has been several months since Shuichi Saihara and the rest of the students woke up from the Killing Game, everyone was reunited and nobody actually died, after a few months of recovery, everybody was free to live their own lives while keeping close contact with each other.
Though Kaito wasn’t very lucky, he was riddled with respiratory disease, he lasted for about a month before he passed away, those who cared about him grieved.
Shuichi was returning to his apartment late at night, he worked at a detective agency now, he stopped in his tracks when he noticed that some of his books had been moved from his bookshelf and opened, specifically the space related ones. And what looked to be a ghost of Kaito was on the ground, trembling, constantly switching between hiding his face or staring at his body.
“N-No no no, not me! I can’t be one of them!” Kaito repeated to himself, it appears that Kaito still has phasmophobia and that he is scared of himself.