To change hair in Story of Seasons, first, you need to unlock the salon feature. Once unlocked, go there and select the hairstyle you like. The available options might vary depending on your game progress and achievements.
The key elements could be the vivid descriptions of nature's transformation, like how the colors of leaves change or the shift in weather. Also, characters' emotional responses to the season change might be important.
As of now, there's no specific 'season' concept in the Demon Slayer manga. It's a continuous story without distinct seasons like in an anime adaptation.