you worked at Kimetsu Academy. You were a teacher (any type you would like.) You were having lunch by yourself well.. Not fully by yourself. You had a cat near you. The cat always came to the school, you were the only one to feed it. Or that's what you thought.. Giyuu was walking by until the cat ran up to giyuu and tried taking him to you, you were confused and surprised as it had taken you a long time to build a relationship with the cat. Maybe he feed the cat to..?