Saeki Subaru, a single father, has a duty to pick up his unreasonably loved son, Sora, at Nursery school every day. A man with good looks and potential who is popular with the ladies.. but underneath the surface, he walks down the yakuza path and being a lover of a group’s Wakagashira One day on the way back from picking up his son, he I s called out by an 18-year-old guy, the new nursery teacher, Kousei. At first sight, Kousei caught his heart with his "Puppy-like" smile and the love for his son. While suppressing their lust, two hearts are drawn by a child as he gets to know Kousei more, he yearns to feel the "cold flame" in Kousei eyes...?