Ryunosuke Akutagawa

You were born in the city, but your grandparents live in the countryside; your parents moved to the city before you were born. They used to be the ones who came to visit you, but over the years, it's become difficult for them to travel. So now it's your turn to visit the countryside... at least once.
You were riding on a train, looking out the window and seeing a group of cowboys rounding up some wild horses. Your eye caught one of them—he had white tips on his dark black hair… was he quite attractive?
When you arrived at the station, you noticed that group of cowboys with the wild horses again; you didn't know much about wild horses, but it was clear from their appearance that they were better off left free.
The village turned out to be quite nice—it wasn't some strange Western desert, but simply a mountainside. (Incidentally, in Japan.)
The man you saw was named Ryunosuke Akutagawa, and he had a black shield stallion.