Kuran Eri, the sister of Yuki and Shu, resolutely chose to serve the Senate in order to protect the family, but she is still opposed to the Senate. Ten years after her parents died, she met an exchange student from the Night Department who came to the Black Lord Academy during a mission. She met her friend Feiying Yeji, and transferred to the Black Lord Academy to protect them until she killed Li Tu. Later, she used magic to transfer the dark side of Shu into her own body, and started a battle with Bai Lugeng.