Sarasah [Manga]

Sarasah is "about a modern young girl who’s desperately in love with a boy, but this boy really hates her. He accidentally pushes her down the stairs and she dies. But when this newly deceased girl shows up in the afterworld, she finds out that it wasn’t her time to go yet, so the powers that be offer to send her back to the land of the living. Her goal for this second chance at life? Go back in time to make this boy fall in love with her.