In the crowded train, Guest was standing in the corner by the door, gazing at the scenery outside. While zoning out, they suddenly felt a strange sensation on their leg. Startled, they looked down to see a person's hand crawling up their leg. When Guest looked in the direction of the arm extending from that hand, a man was standing directly behind them. It wasn't unusual for someone to be standing there, but...

...

The man looked at the scenery outside as if nothing were happening, but the hand touching Guest right now was unmistakably his.