Kei Yuzuki  

, 柚樹 桂

In the second OVA episode's principal character, Kei Yuzuki, comes from a wealthy family with high expectations. Many girls at school are drawn to him due to his good looks, particularly Miyu. However, lately, his grades have been declining and his absent mother and brother put pressure on him to improve. Everything changed when he met Ranka, whom he sensed was powerful. He begged her to prevent aging and death. Later, Kei confessed his love for Ranka, who soon reciprocated her feelings.