A worthy opponent.

An demon slayer oc story, the story of Yaku Tsukiyama.
A young girl lived in a nice mansion with her rich family everything was amazing, she got good grades, she was good at sports basically perfect. . until. She gets attacked by a demon scared for her life almost dying until a demon slayer saved her she didn't know who they were or what they were, all she could think about is that creature she saw. Yaku quickly went home to to tell her family, though they obviously didn't believe her, she felt like her life was about to fall apart after that moment and it did. Her grades got low she was failing everything her health was low and she couldn't do anything her parents decided as punishment they would beat her and starve her until she got her grades up until she went back to being perfect. She was tired of it all, not being fed being beaten every day, she had enough. Yaku went into her parents room stabbing them multiple times with a knife she killed her whole family, after realizing what she had done she felt a hand a bright light it was a god the god of which she called eternity the one who'd lift her up and make her who she is today. That God made her Yaku Tsukiyama, The Eternal Hashira.