Raie (Lai) is a beautiful prince with pure alpha blood who lives a life of freedom without a mate. He loves beautiful things, and when he met an 8-year-old boy named Keisuke Sakaki, Raie decided that he will join his harem when he grew up, so when they parted, he promised that he would definitely come for him. After 10 years, and when Raie comes to pick up Keisuke at the age of 18, he is no longer a pretty boy, but a big young man with one of the strongest masculine auras among the alpha males. Raie is shocked, but he gets even more shocked when Keisuke suddenly goes into rut in front of him. He bites the nape of Raie's neck and tells him "Now you're my mate...".