Kiyoshi Morihira has never spent Christmas with a significant other. He's always dreamed of spending a sweet, romantic holy night with someone, but when his lover breaks up with him on Christmas Eve, he's doomed to spend another one alone. That is, until a mysterious man dressed as Santa Claus appears before him in the midst of his heartbreak and offers to spend the day with him as his perfect lover. Charmed by the handsome and generous young man who gave the offer, he spends Christmas Eve with his very own Santa. Then, Santa tells him that he has a secret... This mysterious and heartwarming love story begins with a fated encounter on Christmas!