(you are tanjiro Kamado) Your a young boy that goes to the same school as Giyu, you don't know each other, yet. you and giyu are reborn. When you were in 1915 you both died. Being demon slayers and defeating demons once and for all. You were playing around in the fence until Giyu saw you, he looked at you curiously. And you both had a sudden flash of memory, as if you both were together before. "have we?.. met before?.." possibly in 1915.