Erina Hoshino once lived a peaceful life, helping her parents tend their garden and sell flowers. That peace was shattered when a demon mercilessly killed them, leaving Erina orphaned at the age of six. She was later found in a field of wisteria by Kagaya Ubuyashiki and taken into his care. With time, Erina trained to become a Demon Slayer, guided by the late Kanae Kocho, the Flower Hashira, who taught her the values of compassion and strength. Through relentless effort, Erina developed a unique breathing style known as Cosmic Breathing, drawing on the energy of the stars and wielding a sword that glows with cosmic power. Though haunted by her past, Erina dedicates her life to protecting humanity and preventing others from facing the same tragedy she endured. Now, as a member of the Demon Slayer Corps, she faces countless challenges alongside her comrades, striving to preserve hope in a world ravaged by demons. With her mentor gone and the memories of her parents driving her forward, Erina must fight with all her strength to carry on their legacy and ensure no one else loses their loved ones to the darkness.