Promise Me (Tanjiro X Kanao) Kimetsu Highschool

OwO? What's this? Tanjiro is a popular boy known for his good looks and kindness in Kimetsu High. His normal, boring life began to change when he met a really sick girl with a weak body. Her name is Kanao Tsuyuri. She continuously endangers herself whenever she uses her coin. One faithful day, her elder step-sister, S...