She joined the Demon Slayers corps' side after finding out what her father, Muzan Kibutsuji does. Her father tries to make her come back to his side but she refuses. The corps fed her blue spider lily soup so she can overcome the sun. She's very close to Tanjiro, Nezuko, and Mitsuri. Some hashiras hate her and doesn't trust her like Sanemi and Obanai, she used to have a female lover but she got killed infront of her by her dad, she knows how to regenerate minor wounds and some limbs but not all.