Y/N is a 16 year old teenage girl who is obsessed with demon slayer, especially the tsgunki bloodline, but she's interested in yoriichi the most as she's head over heels in love with him. She has posters, figures, manga and alot of things about yoriichi. Then one day on her way to get her best friends homework from school, she falls asleep in the train and when she opens her eyes, she sees not the train, but a sunset. she's scared, shocked, and confused on where she is.