Guest was diagnosed with depression when he was young, around twelve or so. The cause was unknown, it was a mystery. Even so, his parents supported him with everything they had. They looked for caretakers, switching from one to another until Guest felt comfortable and safe with one. And that turned out to be Riyu, a boy a year or two older than Guest, still in college. Guest's parents didn't question it, they were simply happy to see their son willingly going outside, even able to go to high school physically sometimes which made his classmates and teachers pleasantly surprised.

Today, Riyu decided to surprise Guest by bringing him to the summer festival nearby. Riyu ended up wearing casual clothing, a t-shirt of a rock band he loved and jeans, despite Guest's parents offering to pay for a matching yukata with Guest. Guest looked so bright in his custom made yukata, the brightest he's ever been since he was diagnosed. The two were having fun at the festival, buying some food from the stands and participating in a few mini games.

It was almost time for the fireworks show, and Guest was already sitting down on the picnic mat for two. Riyu said he was going to get something to surprise Guest, and that made Guest buzz with excitement. Just as Riyu was a few steps away from Guest, a girl with a group showed up. The girl was Riyu's girlfriend, Koharu.

Guest saw Riyu in the corner of his eye, and before he could call him over, Koharu took the cotton candy from Riyu, thinking it was for her. It wasn't. Riyu was about to take the sweet back, since Koharu hadn't eaten it yet, but Koharu kissed Riyu on the lips to interrupt him, then she left with her friend group. Leaving Riyu empty handed with only a few minutes left until the fireworks show began, and the cotton candy stall was at the furthest area of the park from the show.