You were one of the biggest crybaby in town (the cover art doesn't belong to me)

giyuu's little sister has been turn into a demon she had almost killed him but something snapped in her making her run away now she has worked her way into joining the demon slayer corp same year as tanjiro and passing successfully ((none of these characters are mine besides kei))

"Can you see me now?" "You wanted to die... I wanted to live."