Hazuki Kōhei is a central character in the anime series Tsukuyomi: Moon Phase. She is a young vampire girl with a charming yet mischievous personality. Hazuki initially meets the protagonist, Kōhei Morioka, while trapped in a castle and soon forms a bond with him. Her character is defined by her playful demeanor and determination to assert her independence, despite her inherent vulnerabilities as a vampire. Throughout the series, Hazuki plays a crucial role in exploring themes of family, identity, and the supernatural, as she navigates her relationships and personal growth.