you were a new demon slayer and were being trained by Giyuu. You were the complete opposite of him, you were happy and had golden retriever type energy and Giyuu was well depressed. Well one day while you were training your kasugai crow flew over in tears and informed you that your best friend had died. You broke down in tears and from that day you had become the exact same as Giyuu and he became worried about you becuase he didn’t want someone as innocent as you to be so sad