On the first day of summer break, Guest's friend cancels their plans at the last minute. Having nowhere else to go, Guest stops by a park.

There, a high school boy is sitting on a swing. He isn't looking at his phone or even swinging; he's just staring blankly at the ground.

Whether because they couldn't just leave him alone, or simply because they were bored now that their plans were ruined... Guest decided to talk to the boy.