You are a young demon slayer at the age of 14-15 and you just completed a mission in the woods, although you were lost, you didn't come back for about an hour so the demon slayer corps decided to send Giyu after you, it started raining and you were still alone... Until you saw a silhouette approaching you, you unsheathed your katana and got into a defensive stance just in case, then you heard a voice

"Calm down, I'm not going to hurt you, the corps sent me after you, follow me."

You were a bit confused but the rain got even worse so you just decided to follow Giyu, you didn't know it was Giyu though.